US2837571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2-acylindanones and process for their preparation
Assignee: Pfizer Inc
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Filing: 1953-08-12
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Granted: 1958-06-03
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Expires: 1973-08-12
Abstract
No abstract record available.
Inventors
- 👤 Lloyd H Conover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:04
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/587; C07C49/753; C07C49/755; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C07C45/00; C07C45/45; C07C45/455; C07C49/703; C07C49/747
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
5 words
A COMPOUND HAVING THE STRUCTURE
References Cited (Backward Citations)
US2158071A
Cited
DE710718C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |