Inventor

Cletus N. Welch

Inventor

Clinton, OH, US

Overview

25→

Patents

1976–2006

Patent span

Chemistry

Primary field (CPC C)

Patents· 25 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

G02Bprimary

G02BOptical elements, systems or apparatus17%

C25BElectrolytic or electrophoretic processes for the production of compounds or non-metals13%

Y10TTechnical subjects covered by former us classification11%

C09DCoating compositions, e.g. paints, varnishes or lacquers9%

C09KMaterials for miscellaneous applications, not provided for elsewhere7%

C01BNon-metallic elements4%

G03CPhotosensitive materials for photographic purposes4%

B23KSoldering or unsoldering3%

C03CChemical composition of glasses, glazes or vitreous enamels3%

C08FMacromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds3%

PatentTitleYear

6,998,072'Photochromic polymerizable compositions'2006 6,916,537'Articles having a photochromic polymeric coating'2005 6,602,603'Poly(meth)acrylic photochromic coating'2003 6,506,488'Aminoplast resin photochromic coating composition and photochromic articles'2003 6,436,525'Polyanhydride photochromic coating composition and photochromic articles'2002 6,432,544'Aminoplast resin photochromic coating composition and photochromic articles'2002 6,268,055'Photochromic epoxy resin coating composition and articles having such a coating'2001 6,060,001'Alkoxyacrylamide photochromic coatings compositions and photochromic articles'2000 5,391,327'Photochromic compositions of improved fatigue resistance'1995 5,185,390'Water strippable photochromic resin composition'1993 5,130,353'Method for preparing photochromic plastic article'1992 4,880,667'Photochromic plastic article and method for preparing same'1989 4,675,357'Near infrared absorbing polymerizate'1987 4,396,473'Cathode 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 metallization'1983 4,390,512'Process for producing calcium hypochlorite'1983 4,328,200'Process for producing calcium hypochlorite'1982 4,323,595'Nickel-molybdenum cathode'1982 4,312,738'Cathode electrocatalysts for solid polymer electrolyte chlor-alkali cells'1982 4,253,922'Cathode electrocatalysts for solid polymer electrolyte chlor-alkali cells'1981 4,251,478'Porous nickel cathode'1981 4,248,679'Electrolysis of alkali metal chloride in a cell having a nickel-molybdenum cathode'1981 4,135,995'Method of electrolysis, and electrode for the electrolysis'1979 4,101,624'Method of casting silicon'1978 3,958,741'Method of mounting silicon anodes in a chlor-alkali cell'1976 3,956,098'Apparatus containing silicon metal joints'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976–1993Patents assigned to PPG INDUSTRIES INC (16)· patent assignee history

1976–1989Based in Clinton, OH, US· patent location history

1992–2003Based in Murrysville, PA, US· patent location history

1995–2006Patents assigned to TRANSITIONS OPTICAL INC (3)· patent assignee history

2000–2003Patents assigned to PPG IND OHIO INC (6)· patent assignee history

2003–2006Based in Massillon, OH, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
PPG INDUSTRIES INC	16	1976–1993
PPG IND OHIO INC	6	2000–2003
TRANSITIONS OPTICAL INC	3	1995–2006

Locations

Location	Patents	Span
Clinton, OH, US	14	1976–1989
Murrysville, Pennsylvania, US	8	1992–2003
Massillon, OH, US	3	2003–2006