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US2457640A
Expired / Lapsed
US
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Hydroxycarboxylic acid
Assignee: Rohm and Haas Co
•
Filing: 1945-11-09
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Granted: 1948-12-28
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Expires: 1965-11-09
Abstract
No abstract record available.
Inventors
- 👤 Herman A Bruson
- 👤 Warren D Niederhauser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:50
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/06; C10; C10M; C10M1/00; C10M1/08; C10M2209/00; C10M2209/02; C10M2209/10; C10N; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2033131A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-28 | 1952-06-28 | 1952-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-28 | 1956-06-28 | 1956-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-28 | 1960-06-28 | 1960-12-28 | $7700.00 | Window Closed / Lapsed |