US2454547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric quaternary ammonium salts
Assignee: Rohm and Haas Co
•
Filing: 1946-10-15
•
Granted: 1948-11-23
•
Expires: 1966-10-15
Abstract
No abstract record available.
Inventors
- 👤 Louis H Bock
- 👤 Alva L Houk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:38
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/0206; C08G73/0213; C08G73/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL22339C
Cited
FR790279A
Cited
US2143388A
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US2129264A
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US2214352A
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US2185163A
Cited
US2180809A
Cited
US2271378A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-23 | 1952-05-24 | 1952-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-23 | 1956-05-24 | 1956-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-23 | 1960-05-24 | 1960-11-23 | $7700.00 | Window Closed / Lapsed |