Patent US2662083A successfully refreshed from Google Patents.
US2662083A
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Heterocyclic polymethylene-bisquaternary ammonium salts and process for preparing same
Assignee: Allen and Hanburys Ltd
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Filing: 1951-09-28
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Granted: 1953-12-08
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Expires: 1971-09-28
Abstract
No abstract record available.
Inventors
- 👤 Eastland Cyril Jack
- 👤 Taylor Edwin Percival
- 👤 Jackson Henry Oswald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:56
CPC Classifications
C; C07; C07D; C07D217/00; C07D217/12; C07D217/18; C07D217/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
HETEROCYCLIC POLYMERTHYLENE-BIS-QUATERNARY AMMONIUM SALTS OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
8 words
HETEROCYCLIC POLYMERTHYLENE-BIS-QUATERNARY AMMONIUM SALTS OF THE GENERAL FORMULA:
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) | 1956-12-07 | 1957-06-08 | 1957-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-07 | 1961-06-08 | 1961-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-07 | 1965-06-08 | 1965-12-08 | $7700.00 | Window Closed / Lapsed |