US2993894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrenes and process for their preparation
Assignee: Union Carbide Corp
•
Filing: 1958-12-24
•
Granted: 1961-07-25
•
Expires: 1978-12-24
Abstract
No abstract record available.
Inventors
- 👤 Marcus Erich
- 👤 John T Fitzpatrick
- 👤 Jr Frederick C Frostick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:21
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/02; C07D295/027; C07D295/03; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/72; C07D213/74; C07C; C07C2603/00; C07C2603/02; C07C2603/40; C07C2603/42; C07C2603/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
4 words
COMPOUNDS HAVING THE FORMULA:
Claim 2
Dependent Claim
4 words
COMPOUNDS HAVING THE FORMULA:
References Cited (Backward Citations)
US1873402A
Cited
US2108147A
Cited
GB536881A
Cited
US2403483A
Cited
US2577121A
Cited
US2636032A
Cited
GB703309A
Cited
US2647896A
Cited
DE956851C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |