Chen S Yu

US Patent:

7933226, Apr 26, 2011

Filed:

Mar 24, 2004

Appl. No.:

10/809018

Inventors:

Allison G. Woodruff - Foster City CA, US
Paul M. Aoki - Foster City CA, US
Margaret H. Szymanski - Santa Clara CA, US
James D. Thornton - Redwood City CA, US
Daniel H. Wilson - Pittsburgh PA, US
Chen Yu - Rochester NY, US

Assignee:

Palo Alto Research Center Incorporated - Palo Alto CA

International Classification:

H04L 12/16

US Classification:

370260, 370261, 370263, 370264, 370329, 370341, 379 932, 379158, 37920201, 37920501, 704231, 704270, 704275

Abstract:

One embodiment of the invention is a computer controlled method for use with a communication system. The method includes a step of receiving a plurality of communications, where each one of the plurality of communications is from one of a plurality of communication sources; includes a step of mixing (that is responsive to a plurality of floor controls) the plurality of communications for a plurality of outputs associated with plurality of communication sources; and includes a step of analyzing, for a plurality of users associated with the plurality of communication sources, one or more conversational characteristics of two or more of the plurality of users. The method also includes a step of automatically adjusting the plurality of floor controls responsive to the step of analyzing. Other embodiments include systems and devices that use the method as well as program products that cause a computer to execute the method.

US Patent:

42595215, Mar 31, 1981

Filed:

Oct 9, 1979

Appl. No.:

6/083186

Inventors:

John Kazan - Bridgewater NJ
Chen S. Yu - Middlesex NJ

Assignee:

American Cyanamid Company - Stamford CT

International Classification:

C07B 2000

US Classification:

562401

Abstract:

An improved process is disclosed for resolving DL-mandelic acid using optically active 2-amino-1-butanol. The known process comprises: (a) reacting DL-mandelic acid with optically active 2-amino-1-butanol in an alcohol or alcohol mixture to form an optically active mandelate salt; (b) cooling and recovering the salt; (c) mixing the salt with water and distilling off any residual alcohol; (d) acidifying the mixture with a mineral acid; and (e) cooling and recovering the optically active mandelic acid. The improvement comprises: recycling the mother liquor of step (b) into step (a); heating the mother liquor with an alkalizing agent to obtain a racemic solution; neutralizing the racemic solution to precipitate an alkali or alkaline earth metal salt; separating the metal salt; recycling the mother liquor from the separating step into step (a); and recycling the mother liquor from step (e) into step (c).

US Patent:

42608155, Apr 7, 1981

Filed:

Oct 9, 1979

Appl. No.:

6/083183

Inventors:

John Kazan - Bridgewater NJ
Chen S. Yu - Middlesex NJ

Assignee:

American Cyanamid Company - Stamford CT

International Classification:

C07B 2000

US Classification:

562401

Abstract:

A process for preparing a solution of DL-mandelic acid is disclosed. The process consists essentially of heating a solution consisting essentially of an optically active 2-amino-1-butanol mandelate and an alkalizing agent, with or without an alcohol solvent; neutralizing the resulting solution with a mineral acid or a mineral acid salt to precipitate an alkali or alkaline earth metal salt; separating the metal salt; and recovering the solution of DL-mandelic acid.