Robert A Erickson

US Patent:

49451723, Jul 31, 1990

Filed:

Nov 28, 1989

Appl. No.:

7/442040

Inventors:

John B. Hill - Woodstock IL
Hugh L. Dryden - Deerfield IL
Robert Erickson - Des Plaines IL

Assignee:

The Nutra Sweet Company - Deerfield IL

International Classification:

C07D30722

US Classification:

549253

Abstract:

N-formyl-L-aspartic anhydride is prepared using a minimum excess of formic acid. Acetic anhydride and a C. sub. 3 -C. sub. 6 secondary alcohol are added to the reaction mixture to consume excess formic acid. The reaction is suitable for further reactions without modification.

US Patent:

53269080, Jul 5, 1994

Filed:

Dec 9, 1992

Appl. No.:

7/988052

Inventors:

Robert Erickson - Des Plaines IL
Ron Bray - Buffalo Grove IL
Mark Johnson - Grayslake IL
Loraine Klein - Streamwood IL
Dennis A. Seagle - Buffalo Grove IL

International Classification:

C07C22900

US Classification:

562561

Abstract:

The present invention is an improved process for the synthesis of asparagine, a non-essential amino acid useful in food and medical applications. The process utilizes mineral acid to make an intermediate beta-methyl aspartate from a reaction mixture of aspartic acid and methanol. The intermediate product is then amminated in situ and asparagine collected with no need for an isolation step of the intermediates.

US Patent:

44529945, Jun 5, 1984

Filed:

Mar 2, 1981

Appl. No.:

6/239822

Inventors:

John B. Hill - Woodstock IL
Robert A. Erickson - Des Plaines IL

Assignee:

G. D. Searle & Co. - Skokie IL

International Classification:

C07C17700

US Classification:

560121

Abstract:

An improved process for isolating organic compounds from crude product or reaction mixtures by dissolving said crude product or reaction mixture in a suitable solvent, contacting the resulting solution with a lithium salt to form a solid metal salt complex, separating, and thereafter recovering a pure product by decomposing the lithium salt complex.

US Patent:

55874819, Dec 24, 1996

Filed:

Feb 20, 1996

Appl. No.:

8/603744

Inventors:

David R. Allen - Oak Brook IL
Scott Jenkins - San Francisco CA
Loraine Klein - Streamwood IL
Robert Erickson - Des Plaines IL
Diane Froen - Hoffman Estates IL

Assignee:

The Monsanto Company - St. Louis MO

International Classification:

C07D21716

US Classification:

546146

Abstract:

Methods for preparing (S)-N-tert-butyl-1,2,3,4-tetrahydro-3-isoquinoline-carboxamide ("tic-c"), and converting tic-c to (S)-decahydroisoquinoline-3-carboxylic acid t-butylamide ("tic-d") are disclosed. The initial step in the formation of tic-c involves the phosgenation of a substituted tetrahydroisoquinoline to form an N-carboxy anhydride. Tic-d is used as an intermediate in the synthesis of known compounds having pharmaceutical activity.

US Patent:

45852170, Apr 29, 1986

Filed:

Sep 20, 1983

Appl. No.:

6/534184

Inventors:

Robert W. Erickson - North Aurora IL

International Classification:

B23Q 306
B23D 708

US Classification:

269 56

Abstract:

Four square tooling plates each have an outer surface on which a plurality of workpieces are attached. The inner face of each tooling plate is precisely attached to a respective vertical surface of a rectangular block by means of a dowel extending into geometrically centered holes in the vertical face of the block and the tooling plate. Precise rotational alignment of the tooling plate with the block is achieved by a peg extending from the vertical face of the block into a timing hole in the tooling plate spaced from the center hole thereof. The block, with workpiece-loaded tooling plates thereon, is lowered onto a rotary table so that a geometric axis of the block is perfectly aligned with the rotational axis of the rotary table. Rotational alignment of the block with the rotary table is achieved by mating of keys extending from the bottom of a base plate of the block into keyways in the surface of the rotary table. A numerically controlled machining device automatically machines each workpiece on the first tooling plate, causes rotation of the rotary table by 90 degrees, machines the workpieces on the second tooling plate, again indexes the rotary table 90 degrees, etc.

US Patent:

45298114, Jul 16, 1985

Filed:

Feb 6, 1984

Appl. No.:

6/577424

Inventors:

John B. Hill - Woodstock IL
Robert A. Erickson - Des Plaines IL

Assignee:

G. D. Searle & Co. - Skokie IL

International Classification:

C07C17700

US Classification:

560121

Abstract:

An improved process for isolating organic compounds from crude product or reaction mixtures by dissolving said crude product or reaction mixture in a suitable solvent, contacting the resulting solution with a lithium salt to form a solid metal salt complex, separating, and thereafter recovering a pure product by decomposing the lithium salt complex.

US Patent:

48013552, Jan 31, 1989

Filed:

Jan 16, 1987

Appl. No.:

7/004545

Inventors:

Norman E. Johnstone - Schaumburg IL
John C. Gaynor - Des Plaines IL
Robert W. Erickson - Lindenhurst IL

Assignee:

United States Gypsum Company - Chicago IL

International Classification:

D21H 378

US Classification:

1621813

Abstract:

A tabular variety of acicular gypsum crystal filler is prepared by hydrating calcium sulfate dihydrate particles in a seeded continuously stirred reactor at a low level of super-saturation to obtain crystals having an aspect ratio of about 100:10:1 and average length in the longest dimension of about 100-450 micrometers. For the manufacture of paper, the obtained tabular crystal slurry may be directly added to the paper pulp before web formation to obtain a filled paper having high filler retention.

US Patent:

51066009, Apr 21, 1992

Filed:

Sep 14, 1988

Appl. No.:

7/244058

Inventors:

Norman E. Johnstone - Schaumburg IL
John C. Gaynor - Des Plains IL
Robert W. Erickson - Lindenhurst IL

Assignee:

United States Gypsum Company - Chicago IL

International Classification:

C01F 1146

US Classification:

423164

Abstract:

A process for economically producing tabular acicular gypsum crystals in a continuously stirred reactor is disclosed. The process involves establishing a steady state atmospheric pressure reaction zone of about 20% to about 25% by weight solids of gypsum crystals in water at a temperature of about 50. degree. C. to about 60. degree. C. with continuous mild agitation. Calcium sulfate hemihydrate is fed to the reaction zone at a rate to maintain a low level of supersaturation, and a suspension of gypsum crystals in water containing crystals of a mean particle length at least greater than 45 microns is withdrawn.