US2632761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substituted pyridinium salts
Assignee: Bristol Laboratories Inc
•
Filing: 1950-05-10
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Granted: 1953-03-24
•
Expires: 1970-05-10
Abstract
No abstract record available.
Inventors
- 👤 Lee C Cheney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:13
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D213/16; C07D213/20; C07D213/24; C07D213/28; C07D213/30; C07D213/60; C07D213/61; C07D213/62; C07D213/63; C07D213/65; C07D213/78; C07D213/79; C07D213/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
9 words
A NEW CLASS OF COMPOUNDS HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
9 words
A NEW CLASS OF COMPOUNDS HAVING THE GENERAL FORMULA
References Cited (Backward Citations)
DE381180C
Cited
US2446792A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-23 | 1956-09-22 | 1957-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-23 | 1960-09-22 | 1961-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-23 | 1964-09-22 | 1965-03-24 | $7700.00 | Window Closed / Lapsed |