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Durga V Subramanian

from San Jose, CA
Age ~74

Durga Subramanian Phones & Addresses

  • 5925 Hillview Ave, San Jose, CA 95123 (781) 862-8602
  • 7 Haskell St, Lexington, MA 02420 (781) 862-8602
  • 643 Longley Rd, Groton, MA 01450 (978) 448-3288
  • 7 Haskell St, Lexington, MA 02420 (617) 794-3933

Work

Position: Building and Grounds Cleaning and Maintenance Occupations

Education

Degree: High school graduate or higher

Emails

Publications

Us Patents

Coordinated Metal Compounds For Reducing Chromium

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US Patent:
7927418, Apr 19, 2011
Filed:
Aug 9, 2007
Appl. No.:
12/376919
Inventors:
Neal S. Berke - Chelmsford MA, US
Leslie A. Jardine - Burlington MA, US
Vijay Gupta - Woburn MA, US
Charles R. Cornman - Huntington Beach CA, US
Urszula B Latosiewicz - Arlington MA, US
Felek Jachimowicz - Brookline MA, US
Durga Subramanian - Lexington MA, US
Assignee:
W. R. Grace & Co.-Conn. - Columbia MD
International Classification:
C04B 22/00
US Classification:
106713, 106727, 106823
Abstract:
Methods and compositions involving the use of nitrogen-containing coordinated metal compounds for stabilizing chromium VI reducing metal cations. Exemplary uses include processes for making cement, and exemplary compositions include cement additives, concrete admixtures, as well as hydratable cement and cementitous compositions.

Suppression Of Antagonistic Hydration Reactions In Blended Cements

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US Patent:
8518176, Aug 27, 2013
Filed:
Oct 30, 2009
Appl. No.:
13/119306
Inventors:
Denise A. Silva - Arlington MA, US
Josephine Cheung - Lexington MA, US
Paul Sandberg - Beverly MA, US
Lawrence Roberts - Acton MA, US
Durga V. Subramanian - Lexington MA, US
John L. Gallagher - Bollingham MA, US
Lawrence L. Kuo - Acton MA, US
Assignee:
W. R. Grace & Co.-Conn. - Columbia MD
International Classification:
C04B 18/06
US Classification:
106705, 106DIG 1
Abstract:
Method for suppressing antagonistic hydration reactions in Portland fly ash cement involves the use of unponded fly ash that is pre-hydrated, preferably as an aqueous slurry wherein fly ash, preferably having an alkaline earth metal oxide of at least 10% by weight, is soaked, whereby the hydration reaction of the resultant mixed fly ash and cement is accelerated when these components are mixed together with water to hydrate the cement. Blended Portland cement/fly ash compositions of the invention will also have higher early strength as well as shorter set time compared to untreated blends.

Analysis Of Aluminum In Amino Acids By High Performance Liquid Chromatography

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US Patent:
52428346, Sep 7, 1993
Filed:
Nov 14, 1991
Appl. No.:
7/792124
Inventors:
Durga V. Subramanian - Groton MA
Assignee:
Hampshire Chemical Corp. - Lexington MA
International Classification:
G01N 3320
G01N 3002
US Classification:
436 73
Abstract:
An analytical method for determining aluminum in amino acids such as glycine. A complex of aluminum and dihydroxyazobenzene is formed by reacting the amino acid solution with a mixture of dihydroxyazobenzene and acetonitrile in the presence of a buffer to obtain a pH of between about 7 and 8. The resulting complex is analyzed for aluminum by high performance liquid chromatography. Minimization of aluminum contamination is achieved by reducing the number of reagents used in the procedure.
Durga V Subramanian from San Jose, CA, age ~74 Get Report