Cary S Marshall

US Patent:

44976976, Feb 5, 1985

Filed:

Mar 2, 1984

Appl. No.:

6/585662

Inventors:

Cary S. Marshall - Danville CA
Scott D. Troyer - Pittsburg CA

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C25B 300

US Classification:

204 73R

Abstract:

The rate of production of 3,6-dichloropicolinic acid by reduction of tetrachloropicolinic acid in basic aqueous solution in a given cell can be considerably increased if a trichloropicolinic acid is added to the tetrachloropicolinic acid feed in substantially greater proportions than can result from in-situ reduction of the tetrachloro acid. Preferably, the trichloro acid is obtained by acid hydrolysis of by-products of symmetrical tetrachloropyridine manufacture by chlorination/chlorinolysis of 6-chloro-2-(trichloromethyl)pyridine.

US Patent:

41828500, Jan 8, 1980

Filed:

Dec 19, 1977

Appl. No.:

5/861609

Inventors:

Cary S. Marshall - Danville CA
Robert S. Steffanson - Concord CA

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08J 314
C08G 6362

US Classification:

528480

Abstract:

Production of polycarbonate or phenolphthalein polycarbonate copolymers and method for recovery of solid copolymer from solution.