Patent US4708919A successfully refreshed from Google Patents.
Patent US2327191A successfully refreshed from Google Patents.
US2327191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of fumaric acid
Assignee: Pfizer Inc
•
Filing: 1939-12-07
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Granted: 1943-08-17
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Expires: 1959-12-07
Abstract
No abstract record available.
Inventors
- 👤 Jasper H Kane
- 👤 Philip F Amann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:22
CPC Classifications
C; C12; C12P; C12P7/00; C12P7/40; C12P7/44; C12P7/46; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/911; Y10S435/913; Y10S435/931; Y10S435/939
Claims Analysis
Total Claims: 0
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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) | 1946-08-16 | 1947-02-15 | 1947-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-08-16 | 1951-02-15 | 1951-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-08-16 | 1955-02-15 | 1955-08-17 | $7700.00 | Window Closed / Lapsed |