US2162971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycarboxylic acid and process of preparing the same
Assignee: Armour and Co
•
Filing: 1938-05-27
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Granted: 1939-06-20
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Expires: 1958-05-27
Abstract
No abstract record available.
Inventors
- 👤 Anderson W Ralston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:09
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/02; C08G61/04; C08G63/00; C08G63/02; C08G63/12; C08G63/123; C08G63/137
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) | 1942-06-19 | 1942-12-19 | 1943-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-06-19 | 1946-12-19 | 1947-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-06-19 | 1950-12-19 | 1951-06-20 | $7700.00 | Window Closed / Lapsed |