Inventor

Harlan B. Johnson

Inventor

Rittman, OH, US

Overview

24→

Patents

1976–1994

Patent span

Chemistry

Primary field (CPC C)

Patents· 24 as inventor

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

C25Bprimary

C25BElectrolytic or electrophoretic processes for the production of compounds or non-metals22%

C01BNon-metallic elements9%

A01NPreservation of bodies of humans or animals or plants or parts thereof6%

A41GArtificial flowers6%

A61LMethods or apparatus for sterilising materials or objects in general6%

B29CShaping or joining of plastics6%

B29KIndexing scheme associated with subclasses b29b, b29c or b29d, relating to moulding materials or to materials for moulds, reinforcements, fillers or preformed parts, e.g. inserts6%

C01PIndexing scheme relating to structural and physical aspects of solid inorganic compounds6%

C08JWorking-up6%

Y10TTechnical subjects covered by former us classification6%

PatentTitleYear

5,326,391'Microporous material exhibiting increased whiteness retention'1994 5,071,645'Process of producing an active agent delivery device'1991 5,035,886'Active agent delivery device'1991 5,009,971'Gas recombinant separator'1991 5,009,806'Calcium hypochlorite article'1991 4,970,020'Calcium hypochlorite composition'1990 4,959,208'Active agent delivery device'1990 4,865,760'Calcium hypochlorite composition'1989 4,849,297'Article having a corrosion inhibiting coating'1989 4,837,253'Corrosion inhibiting pigment'1989 4,681,750'Preparation of amorphous, precipitated silica and siliceous filler-reinforced microporous polymeric separator'1987 4,329,209'Process using an oxidant depolarized solid polymer electrolyte chlor-alkali cell'1982 4,313,813'Fixed bed oxygen depolarized cathode chlor-alkali cell'1982 4,253,924'Solid polymer electrolyte chlor-alkali process'1981 4,244,793'Brine electrolysis using fixed bed oxygen depolarized cathode chlor-alkali cell'1981 4,105,516'Method of electrolysis'1978 4,101,624'Method of casting silicon'1978 4,101,394'Electrolytic method'1978 4,055,477'Electrolyzing brine using an anode coated with an intermetallic compound'1977 4,040,918'Method of activating an anode'1977 4,007,107'Electrolytic anode'1977 3,990,957'Method of electrolysis'1976 3,963,593'Electrodes having silicide surface'1976 3,958,741'Method of mounting silicon anodes in a chlor-alkali cell'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976–1994Patents assigned to PPG INDUSTRIES INC (24)· patent assignee history

1976–1991Based in Rittman, OH, US· patent location history

1991Based in Seville, OH, US· patent location history

1994Based in Pittsburgh, PA, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
PPG INDUSTRIES INC	24	1976–1994

Locations

Location	Patents	Span
Rittman, OH, US	22	1976–1991
Pittsburgh, Pennsylvania, US	1	1994
Seville, OH, US	1	1991