Patent US2873278A successfully refreshed from Google Patents.
US2873278A
Expired / Lapsed
US
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Certain 4-acyl-1, 2-diphenyl-3, 5-dioxopyrazolidines
Assignee: Pfizer Italia SRL
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Filing: 1955-06-03
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Granted: 1959-02-10
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Expires: 1975-06-03
Abstract
No abstract record available.
Inventors
- 👤 Logemann Willy
- 👤 Lauria Francesco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:15
CPC Classifications
C; C07; C07D; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/28; C07D231/30; C07D231/32; C07D231/36
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
4 words
COMPOUNDS OF THE FORMULA
References Cited (Backward Citations)
US2562830A
Cited
BE506891A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-09 | 1962-08-11 | 1963-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-09 | 1966-08-11 | 1967-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-09 | 1970-08-11 | 1971-02-10 | $7700.00 | Window Closed / Lapsed |