Patent US2779780A successfully refreshed from Google Patents.
US2779780A
Expired / Lapsed
US
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1, 4-diamino-2, 3-dicyano-1, 4-bis (substituted mercapto) butadienes and their preparation
Assignee: EIDP Inc
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Filing: 1955-03-01
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Granted: 1957-01-29
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Expires: 1975-03-01
Abstract
No abstract record available.
Inventors
- 👤 William J Middleton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:59
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
A SUBSTITUTED BUTADIENE HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
7 words
A SUBSTITUTED BUTADIENE HAVING THE GENERAL FORMULA
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) | 1960-01-29 | 1960-07-30 | 1961-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-29 | 1964-07-30 | 1965-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-29 | 1968-07-30 | 1969-01-29 | $7700.00 | Window Closed / Lapsed |