1
Barry Van Gemert, Anu Chopra, Anil Kumar: Polymerizable polyalkoxylated naphthopyrans. Transitions Optical, Frank P Mallak, Irwin M Stein, September 5, 2000: US06113814 (112 worldwide citation)

Described are novel photochromic polymerizable polyalkoxylated naphthopyran compounds, examples of which are certain 2H-naphtho[1,2-b]pyrans, 3H-naphtho[2,1-b]pyrans and indeno[2,1-f]naphtho[1,2-b]pyrans each having at least one polyalkoxylated substituent of from 1 to 50 alkoxy units per substituen ...


2
Barry Van Gemert, Anil Kumar: Photochromic substituted naphthopyran compounds. Transitions Optical, Frank P Mallak, Irwin M Stein, November 14, 1995: US05466398 (110 worldwide citation)

Described are novel reversible photochromic 3H-naphtho[2,1-b]pyran compounds, of the following graphic formula: ##STR1## wherein R.sub.1 is hydrogen or alkyl, R.sub.2 is hydrogen or preferably a carboalkoxy group and R.sub.3 is hydrogen or preferably an alkyl group, provided that either R.sub.1 or R ...


3
Anil Kumar, Barry Van Gemert, David B Knowles: Substituted naphthopyrans. Transitions Optical, Frank P Mallak, Irwin M Stein, October 17, 1995: US05458814 (103 worldwide citation)

Described are novel reversible photochromic naphthopyran compounds, examples of which are compounds having certain substituents at the number 5 and 6 carbon atoms of the naphtho portion of the naphthopyran and at the 2-position of the pyran ring. Certain substituents may also be present at the numbe ...


4
Anil Kumar, David B Knowles, Barry Van Gemert: Substituted naphthopyrans. Transitions Optical, Frank P Mallak, Irwin M Stein, August 19, 1997: US05658501 (96 worldwide citation)

Described are novel reversible photochromic 2H-naphtho�1,2-b! pyran compounds, examples of which are compounds having certain substituents at the number 5 carbon atom of the naphtho-portion of the naphthopyran and at the 2-position of the pyran ring. Certain substituents may also be present at the n ...


5
Anil Kumar: Benzopyran compounds. Transitions Optical, Frank P Mallak, Irwin M Stein, July 4, 1995: US05429774 (96 worldwide citation)

Described are novel reversible photochromic benzopyran compounds, examples of which are compounds having the 2,3 position of a benzofurano or benzothieno group fused to the f, g, or h side of the benzopyran, or a benzo group fused to the f side of the benzopyran, and (i) a substituted or unsubstitut ...


6
Clara M Nelson, Anu Chopra, Olga G Petrovskaia, David B Knowles, Barry Van Gemert, Anil Kumar: Indeno-fused photochromic naphthopyrans. PPG Industries Ohio, Frank P Mallak, October 2, 2001: US06296785 (95 worldwide citation)

Described are novel photochromic indeno-fused naphthopyran compounds, examples of which include naphthopyran compounds having a substituted or unsubstituted indeno group, the 2,1 positions of which are fused to the naphtho portion of the naphthopyran as shown below. Also present on the naphthopyran ...


7
Anil Kumar: Photochromic heterocyclic fused indenonaphthopyrans. PPG, Frank P Mallak, Irwin M Stein, December 16, 1997: US05698141 (90 worldwide citation)

Described are novel photochromic heterocyclic fused indenonaphthopyran compounds having a substituted or unsubstituted heterocyclic ring fused to the g, h, i, n, o or p side of the indenonaphthopyran. These compounds may be represented by either of the following graphic formulae: ##STR1## Also descr ...


8
Anil Kumar, Larry P Pelty: High-strength tungsten carbide material for use in earth-boring bits. Baker Hughes Incorporated, Felsman Bradley Gunter & Dillon, January 25, 1994: US05281260 (82 worldwide citation)

A sintered hard metal compact for use in earth-boring bits comprises 80 to 94% by weight tungsten carbide particles, 5.4 to 18% by weight cobalt particles and 0.6 to 2.0% by weight nickel particles wherein the ratio of cobalt to nickel is approximately 9:1 by weight. These materials are formed accor ...


9
Amarjit Singh, Rajesh Jain, Anil Kumar Singla: Pharmaceutical composition for the control and treatment of anorectal and colonic diseases. Panacea Biotech, University Institute of Pharmaceutical Sciences, Morrison and Foerster, January 12, 1999: US05858371 (78 worldwide citation)

A Novel composition and a method for treating anorectal diseases including hemorrhoids and colonic diseases with long term effectiveness and low prolapse rates is disclosed. The compositions are water soluble and can be uniformly applied in the affected region. The composition comprises Flavonoidal ...


10
Anil Kumar: Photochromic six-membered heterocyclilc-fused naphthopyrans. PPG Industries Ohio, Frank P Mallak, Irwin M Stein, November 28, 2000: US06153126 (77 worldwide citation)

Described are novel photochromic six-membered heterocyclic-fused naphthopyran compounds, examples of which are naphthopyran compounds having an oxazino group fused to one side of the naphtho portion of the naphthopyran and having certain substituents at the position ortho to the oxygen atom of the n ...



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