Search

Ritchie A Wessling

from San Francisco, CA
Age ~92
Get Report
Related to:
Jerome Paul Wessling, 58Rebecca E Lee, 44Christopher M Casaus, 55Susana H Wessling, 59Maria W Bachteal, 63Mountain S Krauss, 48Lilli W Hart, 54Anthony D Wessling, 61Christine M Imfeld, 50Mary M Wessling, 86
Connected to:
Asheley T Wessling, 43Caroline L Wessling, 47Eugene J Wessling, 93Jeremiah C Wessling, 38Jon Wessling, 83Maria A Wessling, 79Mary E Wessling, 65Rick G Wessling, 66Samantha R Wessling, 35Stacey R Wessling, 56

Ritchie Wessling Phones & Addresses

  • 1936 Mason St, San Francisco, CA 94133
  • 127 Romain St, San Francisco, CA 94114
  • 42 Langton St #2, San Francisco, CA 94103

Work

Position: Consultant

Education

Degree: Doctorates, Doctor of Philosophy School / High School: University of Pennsylvania 1959 to 1962 Specialities: Philosophy, Chemistry

Industries

Medical Devices

Resumes

Resumes

Ritchie Wessling Photo 1

Consultant

View page
Location:
San Francisco, CA
Industry:
Medical Devices
Work:

Consultant
Education:
University of Pennsylvania 1959 - 1962
Doctorates, Doctor of Philosophy, Philosophy, Chemistry

Publications

Us Patents

Optical Determination Of Glucose Utilizing Boronic Acid Adducts

View page
US Patent:
20130121925, May 16, 2013
Filed:
Jan 4, 2013
Appl. No.:
13/734815
Inventors:
The Regents of the University of California - Oakland CA, US
Ritchie A. WESSLING - Watsonville CA, US
Assignee:
THE REGENTS OF THE UNIVERSITY OF CALIFORNIA - OAKLAND CA
International Classification:
A61K 49/00
US Classification:
424 96
Abstract:
The present invention concerns an improved optical method and optical sensing device for determining the levels of polyhydroxyl-substituted organic molecules in vitro and/or in vivo in aqueous media. The range of detection is between about 400 and 800 nm. In particular, a sensory devise is implemented in a mammal to determine sugar levels. Specifically, a dye is combined with a conjugated nitrogen-containing heterocyclic aromatic boronic acid-substituted bis-onium compound in the presence of a sugar, such as fructose or glucose. The viologens are preferred as the aromatic conjugated nitrogen-containing boronic acid substituted compounds. The method is useful to determine sugar levels in a human being.

Isothiouronium Stabilized Latexes

View page
US Patent:
39987760, Dec 21, 1976
Filed:
Apr 10, 1975
Appl. No.:
5/566865
Inventors:
Earl H. Wagener - Concord CA
Ritchie A. Wessling - Midland MI
Dale S. Gibbs - Midland MI
Assignee:
The Dow Chemical Company - Midland MI
International Classification:
C08L 3100
US Classification:
260 206SQ
Abstract:
An aqueous dispersion containing a water-insoluble, essentially electrically non-conductive, organic polymer as cation-active particles wherein a substantial portion of the cation-activity is provided by isothiouronium cations may be obtained by various methods including emulsion polymerization of hydrophobic monomers using an isothiouronium surfactant or by emulsion copolymerization of a monomer containing isothiouronium groups with hydrophobic monomers.

Matrix Composites In Which The Matrix Contains Polybenzoxazole Or Polybenzothiazole

View page
US Patent:
51962594, Mar 23, 1993
Filed:
Dec 7, 1990
Appl. No.:
7/624164
Inventors:
Peter E. Pierini - Berkeley CA
Ritchie A. Wessling - Berkeley CA
Peter K. Kim - Danville CA
Assignee:
The Dow Chemical Company - Midland MI
International Classification:
B32B 2702
C08G 1860
US Classification:
428245
Abstract:
Fibers may be prepregged with a dope containing polybenzoxazole or polybenzothiazole. The prepreg may be contacted with water or another nonsolvent to coagulate the polymer and form a matrix composite.

Semi-Permeable Membranes Prepared Via Reaction Of Cationic Groups With Nucleophilic Groups

View page
US Patent:
48392030, Jun 13, 1989
Filed:
Aug 17, 1987
Appl. No.:
7/086122
Inventors:
Thomas E. Davis - Lafayette CA
Donald L. Schmidt - Midland MI
Jee I. Kau - Concord CA
Ritchie A. Wessling - Midland MI
Sharon S. Whipple - Sanford MI
Richard F. Fibiger - Midland MI
Dale M. Pickelman - Auburn MI
Assignee:
The Dow Chemical Company - Midland MI
International Classification:
B32B 2700
US Classification:
427244
Abstract:
A novel composite membrane and methods of making the membrane are described. The discriminating layer of the membrane is prepared by reaction of a reactive cationic compound group with a compound bearing a nucleophilic moiety. At least one of the reactants bears an average of two or more reactive groups. The reaction product contains covalent bonds formed via charge eliminating reactions. In a preferred embodiment of the invention, the nucleophilic group is anionic and a coacervate is formed initially on a microporous substrate. The resulting membrane may be useful for reverse osmosis, gas or ultrafiltration separations.

Stable Concentrates And Emulsions Of Water-Insoluble Organic Pesticides

View page
US Patent:
55080359, Apr 16, 1996
Filed:
Oct 27, 1993
Appl. No.:
8/145055
Inventors:
Ritchie A. Wessling - Berkeley CA
Dale M. Pickelman - Auburn MI
Dennis G. Wujek - Midland MI
Assignee:
DowElanco - Indianapolis IN
International Classification:
A01N 2504
A01N 2508
A01N 2524
US Classification:
424405
Abstract:
Stable emulsions of water-insoluble organic pesticides are formed by mixing the pesticide with an aqueous dispersion of a graft copolymer comprising a reactive polymeric surfactant base polymer and a nonionic hydrophobic grafted composition. The graft copolymer spontaneously absorbs organic pesticides with low water solubility upon simple mixing. The resulting product is much more stable to coalescence than emulsions made with conventional or polymeric surfactants. Emulsifiable organic based concentrates, having a continuous oil phase, which are formed from admixtures of pesticidally active water-insoluble organic pesticides with graft copolymers can be diluted with or in water, thus, inverting the continuous oil phase to stable water based oil-in-water emulsions of the active pesticide.

Chlorine-Stable Membrane Compositions

View page
US Patent:
49419722, Jul 17, 1990
Filed:
Dec 6, 1984
Appl. No.:
6/678870
Inventors:
Jee I. Kau - Concord CA
Dale M. Pickelman - Auburn MI
Donald L. Schmidt - Midland MI
Ritchie A. Wessling - Midland MI
Assignee:
The Dow Chemical Company - Midland MI
International Classification:
B01D 1300
B01D 1301
US Classification:
210490
Abstract:
A novel reverse osmosis membrane comprising a hydroxyalkyl methacrylate film cross-linked with a vinylaralkyl dialkylsulfonium salt is described. This film, when cast on a compatible substrate, results in a membrane of exceptional chlorine resistance.

Film, Fiber, And Microporous Membranes Of Poly(Etheretherketone)Dissolved In High Boiling Point Polar Organic Solvents

View page
US Patent:
49578170, Sep 18, 1990
Filed:
Nov 25, 1988
Appl. No.:
7/276006
Inventors:
Ritchie A. Wessling - Berkeley CA
Assignee:
The Dow Chemical - Midland MI
International Classification:
C08J 928
US Classification:
428436
Abstract:
High boiling point polar organic solvent are useful solvents for poly(etheretherketone)-type polymers (PEEK). Solutions of PEEK may be used to form PEEK articles such as film, microporous sheet membrane, fiber and microporous hollow fibers. The microporous PEEK is useful as an ultrafiltration membrane and as a substrate for the formation of reverse osmosis membranes. A method of making PEEK articles including microporous sheet membranes is disclosed. A method of making PEEK fibers including microporous hollow membrane fibers is disclosed.

Semi-Permeable Membranes Prepared Via Reaction Of Cationic Groups With Nucleophilic Groups

View page
US Patent:
47971878, Jan 10, 1989
Filed:
Aug 17, 1987
Appl. No.:
7/086123
Inventors:
Thomas E. Davis - Lafayette CA
Donald L. Schmidt - Midland MI
Jee I. Kau - Concord CA
Ritchie A. Wessling - Midland MI
Sharon S. Whipple - Sanford MI
Richard F. Fibiger - Midland MI
Dale M. Pickelman - Auburn MI
Assignee:
The Dow Chemical Company - Midland MI
International Classification:
C05B 700
US Classification:
2041802
Abstract:
A novel composite membrane and methods of making the membrane are described. The discriminating layer of the membrane is prepared by reaction of a reactive cationic compound group with a compound bearing a nucleophilic moiety. At least one of the reactants bears an average of two or more reactive groups. The reaction product contains covalent bonds formed via charge eliminating reactions. In a preferred embodiment of the invention, the nucleophilic group is anionic and a coacervate is formed initially on a microporous substrate. The resulting membrane may be useful for reverse osmosis, gas or ultrafiltration separations.
Control profile
Ritchie A Wessling from San Francisco, CA, age ~92 Get Report