Inventor
Sheldon Farber
Inventor
Appleton, WI, US
Overview
Patents· 12 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
B41Mprimary
B41MPrinting, duplicating, marking, or copying processes42%
C07DHeterocyclic compounds42%
C09BOrganic dyes or closely-related compounds for producing dyes, e.g. pigments15%
PatentTitleYear
4,334,072'Lactone compounds containing an indolizine radical'19824,275,206'Lactone compounds containing an indolizine radical'19814,242,513'Lactone compounds containing a heterocyclic radical'19804,232,887'Lactone compounds containing an indolizine radical'19804,119,776'Vinyl phthalide color formers'19784,107,428'Di-vinyl color formers'19784,035,393'Chromogenic derivatives of bis-1,1-disubstituted ethylene and a process for preparing them'19774,026,883'Derivatives of dianhydrides as vinyl color formers'19774,022,771'Aminophenyl lactone compounds containing an ethyleno group'19774,020,056'Di-vinyl phthalides color formers'19774,020,068'Chromogenic furoquinoxalines'19774,016,174'Benzoindole phthalides'1977Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1977–1978Patents assigned to NCR CO (8)· patent assignee history
1977–1982Based in Appleton, WI, US· patent location history
1980–1982Patents assigned to APPLETON PAPER INC (4)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| NCR CO | 8 | 1977–1978 |
| APPLETON PAPER INC | 4 | 1980–1982 |
Locations
| Location | Patents | Span |
|---|---|---|
| Appleton, WI, US | 12 | 1977–1982 |