Patent US2728775A successfully refreshed from Google Patents.
US2728775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
n-cetyl-3 hydroxypyridinium chloride
Assignee: Sadolin and Holmblad AS
•
Filing: 1954-01-11
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Granted: 1955-12-27
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Expires: 1974-01-11
Abstract
No abstract record available.
Inventors
- 👤 Niels K F W Clauson-Kaas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:02
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/62; C07D213/63; C07D213/65
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
THE HIGHER ALKYL QUATERNARY AMMONIUM SALTS OF 3PYRIDOL.
Claim 2
Dependent Claim
8 words
THE HIGHER ALKYL QUATERNARY AMMONIUM SALTS OF 3PYRIDOL.
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) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |