Patent US3203973A successfully refreshed from Google Patents.
US3203973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photodimerization of fumaronitrile
Assignee: Wyeth Holdings LLC
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Filing: 1964-03-12
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Granted: 1965-08-31
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Expires: 1984-03-12
Abstract
No abstract record available.
Inventors
- 👤 Griffin Gary Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:45
CPC Classifications
C; C07; C07C; C07C255/00; C07C255/45
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
3 words
CIS, TRANS, CIS-1,2,3,4-TETRACYANOCYCLOBUTANE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |