Rajeshkumar M Patel

US Patent:

8016937, Sep 13, 2011

Filed:

Jan 22, 2008

Appl. No.:

12/017956

Inventors:

Glenn Schumacher - Baltimore MD, US
Rajeshkumar Patel - Catonsville MD, US
Paul Sampson - Monkton MD, US
Michael Riley - Towson MD, US

Assignee:

Ceratech, Inc. - Alexandria VA

International Classification:

C04B 18/06
C04B 18/08

US Classification:

106705, 106713, 106DIG 1

Abstract:

Cementitious compositions in which the cementitious properties of fly-ash are carefully controlled. The cementitious compositions may be substantially free harsh acids and bases such as citric acids (≈pH 2. 2) and alkali metal activators including alkali hydroxides (≈pH 12-14) and metal carbonates (≈pH 11. 6). The use of these harsh chemicals creates acid base reactions during use of the products. Instead of these harsh chemicals, a citric salt, for example potassium citrate, may be used as a reaction accelerator. Boric compounds may be used as a retarder in the compositions.

US Patent:

8186106, May 29, 2012

Filed:

Aug 3, 2011

Appl. No.:

13/197613

Inventors:

Glenn Schumacher - Baltimore MD, US
Rajeshkumar Patel - Catonsville MD, US
Paul Sampson - Monkton MD, US
Michael Riley - Towson MD, US

Assignee:

CeraTech, Inc. - Alexandria VA

International Classification:

C04B 1/00

US Classification:

52 3, 106705, 106713, 106DIG 1

Abstract:

Cementitious compositions in which the cementitious properties of fly-ash are carefully controlled. The cementitious compositions may be substantially free harsh acids and bases such as citric acids (≈pH 2. 2) and alkali metal activators including alkali hydroxides (≈pH 12-14) and metal carbonates (≈pH 11. 6). The use of these harsh chemicals creates acid base reactions during use of the products. Instead of these harsh chemicals, a citric salt, for example potassium citrate, may be used as a reaction accelerator. Boric compounds may be used as a retarder in the compositions.

US Patent:

20200140333, May 7, 2020

Filed:

Nov 1, 2019

Appl. No.:

16/671277

Inventors:

- Alexandria VA, US
Rajeshkumar D. PATEL - Catonsville MD, US

International Classification:

C04B 28/08
C04B 22/14
C04B 18/08
C04B 22/10
C04B 22/06
C04B 14/04
C04B 24/04

Abstract:

The present disclosure is directed to chemical additives for geopolymer cements that can improve the rheological properties of geopolymer cements. These chemical additives include sulfates and selenates of a specific formula as well as hydroxycarboxylic acid salts of Li, Na, and K including but not limited to glycolic, lactic, citric, mandelic tartaric, and malic acids. The chemical additives for geopolymer cements disclosed herein can facilitate the uniform mixing, increase the time mixtures can be transported, and improve the ability to place and finish concrete and mortars made with the geopolymer cements.

US Patent:

20150122154, May 7, 2015

Filed:

Nov 1, 2013

Appl. No.:

14/070192

Inventors:

- Alexandria VA, US
Rajeshkumar PATEL - Catonsville MD, US
David HOFFMAN - Littlestown PA, US
Frederick KINNEY - Bel Air MD, US

Assignee:

Ceratech Inc. - Alexandria VA

International Classification:

C04B 7/26
C04B 24/34
C04B 24/38
C04B 24/00
C04B 24/04
C04B 24/06

US Classification:

106708

Abstract:

Pozzolanic cement compositions and method manufacturing the same are described. These cement compositions may include a pozzolanic material and an activator based on a salt of glycolic acid, glyceric acid, malic acid, tartaric acid, malonic acid, glutaric acid, maleic acid, formic acid, acetic acid, propionic acid, or butyric acid, a retarder based on hepto-gluconates, sulfate salts, sugars, sugar acids, lignins, and/or an accelerator based on amines. The cement compositions may have less than 10% by weight Portland cement. The pozzolanic cement compositions including these activators, accelerators, and retarders can have improved properties such as longer setting time, better slump retention, and improved strength.

US Patent:

20150101512, Apr 16, 2015

Filed:

Jun 9, 2014

Appl. No.:

14/299138

Inventors:

- Alexandria VA, US
Rajeshkumar PATEL - Catonsville MD, US

International Classification:

C04B 7/26
C04B 22/00
C04B 24/04

US Classification:

106708

Abstract:

Cementitious compositions in which the cementitious properties of fly ash are carefully controlled are described. The cementitious compositions may be substantially free harsh acids and bases such as citric acids (≈pH 2.2) and alkali metal activators including alkali hydroxides (≈pH 12-14) and metal carbonates (≈pH 11.6). The use of these harsh chemicals creates acid base reactions during use of the products. Instead of these harsh chemicals, a lactic acid salt based activator is be used as a reaction accelerator. Boric compounds may be used as a retarder in the compositions.