US2624735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4,4'-polymethylene-bipiperidinium derivatives
Assignee: F Hoffmann La Roche AG
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Filing: 1951-02-01
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Granted: 1953-01-06
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Expires: 1971-02-01
Abstract
No abstract record available.
Inventors
- 👤 Goldberg Moses Wolf
- 👤 Jampolsky Lester Mischa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:17
CPC Classifications
C; C07; C07D; C07D211/00; C07D211/04; C07D211/06; C07D211/08; C07D211/10; C07D211/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
4,4''-POLYMETHYLENEBIS (1,1-DI-LOWER ALKYLPIPERIDINIUM SALTS,) WHEREIN THE POLYMETHYLENE CHAIN CONTAINS AT LEAST FOUR METHYLENE GROUPS.
Claim 2
Dependent Claim
14 words
4,4''-POLYMETHYLENEBIS (1,1-DI-LOWER ALKYLPIPERIDINIUM SALTS,) WHEREIN THE POLYMETHYLENE CHAIN CONTAINS AT LEAST FOUR METHYLENE GROUPS.
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) | 1956-01-06 | 1956-07-07 | 1957-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-01-06 | 1960-07-07 | 1961-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-01-06 | 1964-07-07 | 1965-01-06 | $7700.00 | Window Closed / Lapsed |