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Patent US2650251A successfully refreshed from Google Patents.
US2650251A
Expired / Lapsed
US
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Bactericidal compounds
Assignee: Merck and Co Inc
•
Filing: 1951-02-28
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Granted: 1953-08-25
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Expires: 1971-02-28
Abstract
No abstract record available.
Inventors
- 👤 James M Sprague
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:54
CPC Classifications
A; A01; A01N; A01N33/00; A01N33/02; A01N33/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
QUATERNARY AMMONIUM COMPOUNDS OF THE FORMULA:
Claim 2
Dependent Claim
6 words
QUATERNARY AMMONIUM COMPOUNDS OF THE FORMULA:
References Cited (Backward Citations)
US2276587A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-24 | 1957-02-23 | 1957-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-24 | 1961-02-23 | 1961-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-24 | 1965-02-23 | 1965-08-25 | $7700.00 | Window Closed / Lapsed |