US2852556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bis (p-aminophenyl) butadiene and derivatives
Assignee: Wyeth Holdings LLC
•
Filing: 1954-09-07
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Granted: 1958-09-16
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Expires: 1974-09-07
Abstract
No abstract record available.
Inventors
- 👤 Katz Leon
- 👤 Delton W Hein
- 👤 John E Pretka
- 👤 Robert S Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:28
CPC Classifications
C; C07; C07C; C07C205/00; C07C205/49; C07C205/56; C09; C09B; C09B35/00; C09B35/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
1,4-BIS(P-AMINOPHENYL)BUTADIENES IN WHICH THE SAID BUTADIENE CHAIN IS OTHERWISE UNSUBSTITUTED IN WHICH THE SAID LEAST ONE OF THE TERMINAL CARBON ATOMS IS SUBSTITUTED BY A CARBOXYL GROUP.
Claim 2
Dependent Claim
27 words
1,4-BIS(P-AMINOPHENYL)BUTADIENES IN WHICH THE SAID BUTADIENE CHAIN IS OTHERWISE UNSUBSTITUTED IN WHICH THE SAID LEAST ONE OF THE TERMINAL CARBON ATOMS IS SUBSTITUTED BY A CARBOXYL GROUP.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |