US2783258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unsaturated organic compounds and their preparation
Assignee: Pfizer Inc
•
Filing: 1951-11-08
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Granted: 1957-02-26
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Expires: 1971-11-08
Abstract
No abstract record available.
Inventors
- 👤 Walter D Celmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:11
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/14; C07C57/00; C07C57/02; C07C57/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
20 words
A PROCESS WHICH COMPRISES CONDENSING AN ACETYLENIC COMPOUND OF THE FORMULA RC$CM WITH A 2,3-UNSATURATED ALIPHATIC ALDEHYDE OF THE FORMULA
Claim 2
Dependent Claim
20 words
A PROCESS WHICH COMPRISES CONDENSING AN ACETYLENIC COMPOUND OF THE FORMULA RC$CM WITH A 2,3-UNSATURATED ALIPHATIC ALDEHYDE OF THE FORMULA
References Cited (Backward Citations)
US843289A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-26 | 1960-08-27 | 1961-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-26 | 1964-08-27 | 1965-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-26 | 1968-08-27 | 1969-02-26 | $7700.00 | Window Closed / Lapsed |