Inventor · disambiguated record
Cletus N. Welch
Also filed as: WELCH CLETUS N
25 granted patents·1 pending application·2,202 citations·filing 1974–2002
97Inventor score
Top patents by PatentIndex Score
26 records- 0198US6602603B2Poly(meth)acrylic photochromic coatingPPG IND OHIO INC·Filed 2001·Granted Aug 5, 2003·203 cites·22 claims
- 0298US6268055B1Photochromic epoxy resin coating composition and articles having such a coatingPPG IND OHIO INC·Filed 1998·Granted Jul 31, 2001·237 cites·27 claims
- 0398US6060001AAlkoxyacrylamide photochromic coatings compositions and photochromic articlesPPG IND OHIO INC·Filed 1998·Granted May 9, 2000·205 cites·22 claims
- 0498US5391327APhotochromic compositions of improved fatigue resistanceTRANSITIONS OPTICAL INC·Filed 1994·Granted Feb 21, 1995·221 cites·22 claims
- 0598US4880667APhotochromic plastic article and method for preparing samePPG INDUSTRIES INC·Filed 1987·Granted Nov 14, 1989·235 cites·31 claims
- 0698US4253922ACathode electrocatalysts for solid polymer electrolyte chlor-alkali cellsPPG INDUSTRIES INC·Filed 1979·Granted Mar 3, 1981·77 cites·11 claims
- 0797US6506488B1Aminoplast resin photochromic coating composition and photochromic articlesPPG IND OHIO INC·Filed 1999·Granted Jan 14, 2003·188 cites·25 claims
- 0896US6432544B1Aminoplast resin photochromic coating composition and photochromic articlesPPG IND OHIO INC·Filed 1999·Granted Aug 13, 2002·187 cites·27 claims
- 0995US6436525B1Polyanhydride photochromic coating composition and photochromic articlesPPG IND OHIO INC·Filed 1998·Granted Aug 20, 2002·155 cites·26 claims
- 1094US5130353AMethod for preparing photochromic plastic articlePPG INDUSTRIES INC·Filed 1990·Granted Jul 14, 1992·119 cites·16 claims
- 1193US6916537B2Articles having a photochromic polymeric coatingTRANSITIONS OPTICAL INC·Filed 2002·Granted Jul 12, 2005·28 cites·33 claims
- 1291US5185390AWater strippable photochromic resin compositionPPG INDUSTRIES INC·Filed 1991·Granted Feb 9, 1993·126 cites·10 claims
- 1385US4323595ANickel-molybdenum cathodePPG INDUSTRIES INC·Filed 1980·Granted Apr 6, 1982·33 cites·5 claims
- 1485US4251478APorous nickel cathodePPG INDUSTRIES INC·Filed 1979·Granted Feb 17, 1981·27 cites·19 claims
- 1585US4135995AMethod of electrolysis, and electrode for the electrolysisPPG INDUSTRIES INC·Filed 1978·Granted Jan 23, 1979·25 cites·19 claims
- 1681US4248679AElectrolysis of alkali metal chloride in a cell having a nickel-molybdenum cathodePPG INDUSTRIES INC·Filed 1979·Granted Feb 3, 1981·24 cites·3 claims
- 1774US6998072B2Photochromic polymerizable compositionsTRANSITIONS OPTICAL INC·Filed 2002·Granted Feb 14, 2006·30 cites·32 claims
- 1873US4101624AMethod of casting siliconPPG INDUSTRIES INC·Filed 1974·Granted Jul 18, 1978·16 cites·4 claims
- 1967US4675357ANear infrared absorbing polymerizatePPG INDUSTRIES INC·Filed 1984·Granted Jun 23, 1987·14 cites·15 claims
- 2064US4396473ACathode prepared by electro arc spray metallization, electro arc spray metallization method of preparing a cathode, and electrolysis with a cathode prepared by electro arc spray metallizationPPG INDUSTRIES INC·Filed 1981·Granted Aug 2, 1983·19 cites·2 claims
- 2163US4328200AProcess for producing calcium hypochloritePPG INDUSTRIES INC·Filed 1981·Granted May 4, 1982·15 cites·27 claims
- 2252US3956098AApparatus containing silicon metal jointsPPG INDUSTRIES INC·Filed 1975·Granted May 11, 1976·9 cites·1 claims
- 2349US4390512AProcess for producing calcium hypochloritePPG INDUSTRIES INC·Filed 1982·Granted Jun 28, 1983·8 cites·22 claims
- 2434US3958741AMethod of mounting silicon anodes in a chlor-alkali cellPPG INDUSTRIES INC·Filed 1974·Granted May 25, 1976·1 cites·9 claims
- 2531US2002009599A1Photochromic polyurethane coating and articles having such a coatingFiled 2001·Application pending·0 cites
- 2630US4312738ACathode electrocatalysts for solid polymer electrolyte chlor-alkali cellsPPG INDUSTRIES INC·Filed 1980·Granted Jan 26, 1982·0 cites·6 claims
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