Inventor · Dehradun, IN

Anil Kumar

187Patents

32h-index

146Co-inventors

93Inventor score

Filing activity: Dec 1, 1976 → Aug 16, 2023

Most-cited inventions

Patent	Title	Area	Cited by	Status
US6113814A	Polymerizable polyalkoxylated naphthopyrans	Physics	182	Expired
US5466398A	Photochromic substituted naphthopyran compounds	Chemistry; Metallurgy	178	Expired
US6296785A	Indeno-fused photochromic naphthopyrans	Physics	162	Expired
US5429774A	Benzopyran compounds	Physics	161	Expired
US5658501A	Substituted naphthopyrans	Physics	156	Expired
US5458814A	Substituted naphthopyrans	Physics	155	Expired
US5698141A	Photochromic heterocyclic fused indenonaphthopyrans	Physics	140	Expired
US6348604B1	Photochromic naphthopyrans	Physics	123	Expired
US6153126A	Photochromic six-membered heterocyclilc-fused naphthopyrans	Chemistry; Metallurgy	122	Expired
US5723072A	Photochromic heterocyclic fused indenonaphthopyrans	Physics	102	Expired
US5411679A	Benzopyrans	Physics	96	Expired
US5281260A	High-strength tungsten carbide material for use in earth-boring bits	Chemistry; Metallurgy	96	Expired
US6353102B1	Photochromic naphthopyrans	Chemistry; Metallurgy	96	Expired
US7256921B2	Polarizing, photochromic devices and methods of making the same	Emerging Cross-Sectional Technologies	94	Expired
US6433043B1	Removable imbibition composition of photochromic compound and kinetic enhancing additive	Performing Operations; Transporting	83	Expired
US6022497A	Photochromic six-membered heterocyclic-fused naphthopyrans	Chemistry; Metallurgy	80	Expired
US5651923A	Substituted naphthopyrans	Chemistry; Metallurgy	60	Expired
US5552091A	Benzopyran compounds	Physics	57	Expired
US4117831A	Energy collector for collecting solar energy and the like	Emerging Cross-Sectional Technologies	47	Expired
US5578252A	Photochromic substituted naphthopyran compounds	Physics	47	Expired
US6080338A	Water soluble photochromic compounds, compositions and optical elements comprising the compounds	Chemistry; Metallurgy	45	Expired
US5573712A	Substituted naphthopyrans	Physics	45	Expired
US7342112B2	Photochromic compounds	Physics	43	Expired
US8349210B2	Mesogenic stabilizers	Chemistry; Metallurgy	39	Active
US7097303B2	Polarizing devices and methods of making the same	Performing Operations; Transporting	38	Expired

Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.