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US2773903A
Expired / Lapsed
US
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Process for benzophenones
Assignee: Wyeth Holdings LLC
•
Filing: 1955-07-18
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Granted: 1956-12-11
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Expires: 1975-07-18
Abstract
No abstract record available.
Inventors
- 👤 William B Hardy
- 👤 Warren S Forster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:58
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/76; C07C49/84; C07C45/00; C07C45/45; C07C45/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
9 words
A PROCESS OF PREPARING A BENZOPHENONE OF THE STRUCTURE:
Claim 2
Dependent Claim
9 words
A PROCESS OF PREPARING A BENZOPHENONE OF THE STRUCTURE:
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) | 1959-12-11 | 1960-06-11 | 1960-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-11 | 1964-06-11 | 1964-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-11 | 1968-06-11 | 1968-12-11 | $7700.00 | Window Closed / Lapsed |