Patent US2853490A successfully refreshed from Google Patents.
US2853490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pjjperidine derivatives and preparation
Assignee: —
•
Filing: —
•
Granted: 1958-09-23
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Expires: 1975-09-23
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:15
CPC Classifications
C; C07; C07D; C07D211/00; C07D211/04; C07D211/06; C07D211/08; C07D211/18; C07D211/20; C07D211/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
A PROCESS WHICH COMPRISES CONDENSING A COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
10 words
A PROCESS WHICH COMPRISES CONDENSING A COMPOUND HAVING THE FORMULA
References Cited (Backward Citations)
US2525231A
Cited
US2680116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |