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Gevan R Marrs

from Puyallup, WA
Age ~72
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Also known as:
Gavan R Marrs, Marrs Gevin
Phone and address:
9011 72Nd Ave E, Puyallup, WA 98371
(253) 848-5755
Related to:
Joshua LawrenceTyler C Marrs, 42Kaitlin Marrs, 36Todd Mitchell, 45
Connected to:
Benjamin S Marrs, 45Bobby L Marrs, 65Bonnie J Marrs, 66Candace D Marrs, 39Chris A Marrs, 53Danyel C Marrs, 47Gail M Marrs, 60Gregory Marrs, 55Greta Marrs, 35Jacy L Marrs, 53

Gevan Marrs Phones & Addresses

  • 9011 72Nd Ave E, Puyallup, WA 98371 (253) 848-5755
  • 9802 62Nd Avenue Ct E, Puyallup, WA 98373
  • Spanaway, WA
  • Bothell, WA
  • Kent, WA
  • Bellingham, WA

Work

Company: Weyerhaeuser Jun 1974 to Jul 2014 Position: Senior research scientist

Education

Degree: Masters School / High School: University of Washington 1984 to 1987

Skills

Paper Industry • R&D • Process Engineering • Chemistry • Forestry • Biofuels • Process Optimization • Biomass • Manufacturing • Natural Resource Management • Process Simulation • Materials Science • Analytical Chemistry • Data Analysis • Organic Chemistry • Design of Experiments • Techno Economic Analysis • Product Development • Research and Development

Interests

Vineyards and Winemaking • Bonsai • Primitive Breed Sheep Genetics

Industries

Paper & Forest Products

Resumes

Resumes

Gevan Marrs Photo 1

Bio-Fuels Feedstocks Techno-Economic

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Location:
Puyallup, WA
Industry:
Paper & Forest Products
Work:
Weyerhaeuser Jun 1974 - Jul 2014
Senior Research Scientist
Gevan Marrs Jun 1974 - Jul 2014
Bio-Fuels Feedstocks Techno-Economic Consultant
Jun 1974 - Jul 2014
Bio-Fuels Feedstocks Techno-Economic
Education:
University of Washington 1984 - 1987
Masters Colorado State University 1971 - 1974
Bachelors, Bachelor of Science
Skills:
Paper Industry
R&D
Process Engineering
Chemistry
Forestry
Biofuels
Process Optimization
Biomass
Manufacturing
Natural Resource Management
Process Simulation
Materials Science
Analytical Chemistry
Data Analysis
Organic Chemistry
Design of Experiments
Techno Economic Analysis
Product Development
Research and Development
Interests:
Vineyards and Winemaking
Bonsai
Primitive Breed Sheep Genetics

Publications

Us Patents

Apparatus And Method For Sizing Wood Chips

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US Patent:
50003909, Mar 19, 1991
Filed:
May 30, 1989
Appl. No.:
7/358682
Inventors:
Gevan Marrs - Puyallup WA
Assignee:
Weyerhaeuser Company - Tacoma WA
International Classification:
B02C 1912
US Classification:
241 24
Abstract:
A wood chip sizing apparatus, based on the thickness dimension, which includes a gyratory screen system (16) comprising three separate screens (18, 22, 26) which produces a total of four fractions, one fraction (20) comprising substantially all overthick chips, another fraction (24) comprising both overthick chips and accepts, another fraction (28) comprising substantially all accepts, and another fraction (30) comprising substantially all unders. Fraction (20) is moved directly to a chip slicer (52) which reduces the size of substantially all the chips to accepts. Fraction (24) is directed to a second screening station (42) which separates fraction (24) into two further fractions (44 and 46), one of which (44) comprises overthick chips, and the other of which (46) comprises accepts. The overthick chips (fraction 44) are applied to the chip slicer (52). Fraction (30) is processed to produce products other than pulp, while fractions (28) and (44) and the chips from the chip slicer (52) are moved to storage or a digester for pulping.

Rate Control Overflow System For Disk Screens

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US Patent:
52360938, Aug 17, 1993
Filed:
Nov 13, 1992
Appl. No.:
7/975771
Inventors:
Gevan R. Marrs - Puyallup WA
Assignee:
Weyerhaeuser Company - Tacoma WA
International Classification:
B07C 500
US Classification:
209552
Abstract:
The system includes a variable speed motor (13) which controls the operation of a disk screen (14) which is part of a gyratory screen/disk screening system for wood chips and the like. Wood chips are fed at a variable rate to a storage bin (34), which includes a level sensor (36). The level sensor (36) controls the operation of a star feeder (42) to maintain the level of providing a varying amount of input material to the upstream end of the gyratory screen (12). The speed of the motor (46) driving the star feeder valve (42) is used to develop a control signal for the disk screen motor (13), to ensure a uniform flow rate off the disk screen.

Sample Splitter

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US Patent:
46728562, Jun 16, 1987
Filed:
Jun 20, 1986
Appl. No.:
6/876627
Inventors:
Gevan R. Marrs - Puyallup WA
Kathryn A. Prieve - Thousand Oaks CA
Assignee:
Weyerhaeuser Company - Tacoma WA
International Classification:
G01N 100
US Classification:
7386352
Abstract:
The present invention is a sample splitter used to divide a larger sample of particulate material into representative smaller portions. The device uses a fixed conical sample splitter oriented with it apex upwards. Resting on this and translatable upwards is a sample receiving hopper. The hopper has open top and bottom ends. When receiving a sample to be divided, the bottom of the hopper rests on the splitter cone to form a sample retaining seal. When the hopper is raised, the sample falls by gravity around the splitter cone. An appropriately sized sample receiver located below the splitter cone receives the desired fraction. A generally cylindrical skirt is coaxially located below the splitter cone. The sample receiver is preferably a sector shaped drawer entering the skirt from the side.

Automatic Particle-Size Analyzer

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US Patent:
44873239, Dec 11, 1984
Filed:
May 9, 1983
Appl. No.:
6/492920
Inventors:
Gevan R. Marrs - Puyallup WA
Assignee:
Weyerhaeuser Company - Tacoma WA
International Classification:
B07B 1307
US Classification:
209546
Abstract:
The invention is apparatus which can automatically make a screen analysis of a granular material. The heart of the apparatus is a polygonal drum having graded screens on each of the faces except one. This open face serves as a door for introducing a sample into the interior of the drum and for discharging any material larger than the largest screen. A gear motor and crank arrangement serves to longitudinally shake the drum and agitate the sample. A second gear motor indexes the drum from screen to screen after a predetermined shaking time. Each screen fraction is accumulated on an electronic scale with weights being determined by differential weighing. The gear motors are timed by a microprocessor which also receives screen friction weight inputs and calculates a screen analysis.

Bar Screen Having A Reciprocating Action

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US Patent:
51179830, Jun 2, 1992
Filed:
Aug 7, 1989
Appl. No.:
7/390620
Inventors:
Gevan R. Marrs - Puyallup WA
Assignee:
Weyerhaeuser Company - Tacoma WA
International Classification:
B07B 116
US Classification:
209674
Abstract:
A bar screen (10) for sizing wood chips which includes a plurality of parallel bars (12--12) supported at their respective ends (14, 16) in such a manner and driven in such a manner that each bar moves both longitudinally and vertically. Two alternating sets of bars (12--12) are included, one set being 180. degree. removed in position relative to the other set. The speed and movement of the bars (12--12) is such that the wood chips are tipped up to a vertical orientation and supplied with such a momentum that the chips break contact with the bars and encounter a slot between adjacent bars in their thickness dimension.

Pulp Chip Fissure Test Device And Method For Estimating Screened Pulp Yield

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US Patent:
59707836, Oct 26, 1999
Filed:
Feb 20, 1999
Appl. No.:
9/253168
Inventors:
Benjamin E. Levie - Mercer Island WA
Gail E. Johnson - Auburn WA
Gevan R. Marrs - Puyallup WA
Assignee:
Weyerhaeuser Company - Tacoma WA
International Classification:
G01N 502
US Classification:
73 73
Abstract:
The invention consists of a method and apparatus for estimating screened pulp yield using water uptake rate of a sample of screened pulp chips. A dried chip sample is placed in a wire basket and totally immersed in water. A balance records the rate of water uptake over a period of about 35 seconds. This is preferably entered directly into a computer to give an output closely predicting the yield of screened pulp.

Bar Screen With Bars Of Staggered Height

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US Patent:
53681681, Nov 29, 1994
Filed:
Apr 26, 1993
Appl. No.:
8/053906
Inventors:
Gevan R. Marrs - Puyallup WA
Gail E. Johnson - Auburn WA
Assignee:
Weyerhaeuser Co. - Tacoma WA
International Classification:
B07B 149
US Classification:
209396
Abstract:
A bar screen system comprising two sets of interleaved bars. In each set, the height of the individual bars is staggered so that every third bar is higher than the other bars, which are the same height. The bars are driven such that the bars in one set are approximately 180. degree. behind the other set in their respective predetermined paths of movement, resulting in a tipping and agitation action which tends to present the wood chips loaded at a high rate onto the bar screen in their thickness dimension to the slots between adjacent bars.

Tension Bar Screen

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US Patent:
52842517, Feb 8, 1994
Filed:
Jul 21, 1992
Appl. No.:
7/918645
Inventors:
Gevan R. Marrs - Puyallup WA
Karl B. Werginz - Dunwoody GA
Assignee:
Weyerhaeuser Co. - Tacoma WA
International Classification:
B07B 149
US Classification:
209396
Abstract:
A bar screen apparatus (10) having inner and outer frame assemblies (14, 16), with each frame assembly including a plurality of thin, blade-like bar elements (44). Each frame assembly (14, 16) further includes means for maintaining the blade-like bar elements under tension (58, 76). The inner and outer frame assemblies are driven by a drive system which includes a drive motor (97), a first drive shaft (121) at the infeed end of the apparatus, a second drive shaft (128) at the discharge end of the apparatus and a connecting assembly (126) for connecting the two drive shafts. Certain eccentric cams (114, 116, 118 and 120) are mounted on the first drive shaft (121) and are connected to the inner and outer frame assemblies (14, 16), while other eccentric cams (140, 142, 144 and 146) are mounted on the second drive shaft (128) and are connected to the inner and outer frame assemblies (14, 16), with the bar elements in the inner frame assembly being driven approximately 180. degree. out of phase relative to the bar elements in the outer frame assembly.
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Gevan R Marrs from Puyallup, WA, age ~72 Get Report