Inventor

John K. Howell, Jr.

Inventor

Rochester, MI, US

Overview

12→

Patents

1977–1999

Patent span

Chemistry

Primary field (CPC C)

Patents· 12 as inventor

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

C09Dprimary

C09DCoating compositions, e.g. paints, varnishes or lacquers17%

B05DProcesses for applying fluent materials to surfaces, in general10%

C23CCoating metallic material10%

F25JLiquefaction, solidification or separation of gases or gaseous or liquefied gaseous mixtures by pressure and cold treatment or by bringing them into the supercritical state10%

Y10TTechnical subjects covered by former us classification10%

B01DSeparation7%

B01JChemical or physical processes, e.g. catalysis or colloid chemistry7%

C08LCompositions of macromolecular compounds7%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests7%

C01BNon-metallic elements3%

PatentTitleYear

5,983,667'Cryogenic system for producing ultra-high purity nitrogen'1999 5,901,578'Cryogenic rectification system with integral product boiler'1999 5,690,996'Cross-linked cellulose sponge'1997 5,492,723'Adsorbent medium'1996 4,957,524'Air separation process with improved reboiler liquid cleaning circuit'1990 4,289,826'Water-borne coating for metal surfaces'1981 4,255,305'Coating bath composition and method'1981 4,233,197'Water-borne coating for metal surfaces'1980 4,180,603'Coating bath composition and method'1979 4,174,980'Melamine-formaldehyde and tannin treatment of metal surfaces'1979 4,063,969'Treating aluminum with tannin and lithium'1977 4,039,353'Post-treatment of conversion-coated metal surfaces'1977

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1977–1981Patents assigned to OXY METAL INDUSTRIES CORP (6)· patent assignee history

1977–1981Based in Rochester, MI, US· patent location history

1979–1981Based in North Branch, MI, US· patent location history

1981Patents assigned to HOOKER CHEMICALS PLASTICS CORP (1)· patent assignee history

1990–1999Based in Tonawanda, NY, US· patent location history

1996Patents assigned to SEPRAGEN CORP (1)· patent assignee history

1996–1997Based in Bath, GB· patent location history

1997Patents assigned to SEPRAGEN (1)· patent assignee history

1999Patents assigned to PRAXAIR TECHNOLOGY INC (2)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
OXY METAL INDUSTRIES CORP	6	1977–1981
PRAXAIR TECHNOLOGY INC	2	1999
HOOKER CHEMICALS PLASTICS CORP	1	1981
SEPRAGEN	1	1997
SEPRAGEN CORP	1	1996

Locations

Location	Patents	Span
Rochester, MI, US	4	1977–1981
Tonawanda, New York, US	3	1990–1999
North Branch, MI, US	3	1979–1981
Bath, GB	2	1996–1997