Patent US2548641A successfully refreshed from Google Patents.
Patent US2642434A successfully refreshed from Google Patents.
US2642434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quaternary ammonium salts of lower alkyl 4-substituted-2-(tertiaryaminoalkoxy) benzoates and their preparation
Assignee: STWB Inc
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Filing: 1951-09-05
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Granted: 1953-06-16
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Expires: 1971-09-05
Abstract
No abstract record available.
Inventors
- 👤 Raymond O Clinton
- 👤 Stanley C Laskowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:26
CPC Classifications
C; C07; C07D; C07D211/00; C07D211/04; C07D211/06; C07D211/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
A QUATERNARY AMMONIUM SALT HAVING THE FORMULA
Claim 2
Dependent Claim
7 words
A QUATERNARY AMMONIUM SALT HAVING THE 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) | 1956-06-15 | 1956-12-15 | 1957-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-15 | 1960-12-15 | 1961-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-15 | 1964-12-15 | 1965-06-16 | $7700.00 | Window Closed / Lapsed |