US2641610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quaternary ammonium salts
Assignee: May and Baker Ltd
•
Filing: 1951-10-18
•
Granted: 1953-06-09
•
Expires: 1971-10-18
Abstract
No abstract record available.
Inventors
- 👤 Barber Harry James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:44
CPC Classifications
C; C07; C07C; C07C65/00; C07C65/01; C07C65/105; C07C65/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
A COMPOUND OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
6 words
A COMPOUND OF THE GENERAL FORMULA:
References Cited (Backward Citations)
US2130947A
Cited
US2375853A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |