Patent US2823213A successfully refreshed from Google Patents.
US2823213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic compounds
Assignee: BDH Chemicals Ltd
•
Filing: 1956-12-11
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Granted: 1958-02-11
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Expires: 1976-12-11
Abstract
No abstract record available.
Inventors
- 👤 Kirk David Neville
- 👤 Petrow Vladimir
- 👤 Stuartwebb Isobel Ann
- 👤 Patel Dady Kawashaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:49
CPC Classifications
C; C07; C07J; C07J53/00; C07J75/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
1 words
6-HYDROXY-3:5-CYCLOPREGN-16-EN-20-ONE.
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) | 1961-02-10 | 1961-08-12 | 1962-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-10 | 1965-08-12 | 1966-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-10 | 1969-08-12 | 1970-02-11 | $7700.00 | Window Closed / Lapsed |