US2644003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quaternary ammonium compounds and their manufacture
Assignee: Novartis AG
•
Filing: 1951-02-02
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Granted: 1953-06-30
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Expires: 1971-02-02
Abstract
No abstract record available.
Inventors
- 👤 Gysin Hans
- 👤 Hagenbach Rudolf Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:13
CPC Classifications
C; C07; C07C; C07C233/00; A; A01; A01N; A01N37/00; A01N37/44; C07C233/01; C07C233/45; C07C233/46; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |