Patent US4684446A successfully refreshed from Google Patents.
Patent US3828026A successfully refreshed from Google Patents.
US3828026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the temporary protection of carboxyl groups
Assignee: Individual
•
Filing: 1972-06-01
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Granted: 1974-08-06
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Expires: 1992-06-01
Abstract
Abstract THE PRESENT INVENTION CONCERNS THE TEMPORARY PROTECTION OF A CARBOXYL GROUP BY ESTERIFYING THE CORRESPONDING CARBOXYLIC ACID WITH A 2,2,2-TRIHALOGENOETHANOL, PARTICULARLY 2,2,2-TRICHLOROETHANOL, AND SUBSEQUENTLY SPLITTING THE ESTER GROUPING BY TREATMENT WITH A CHEMICAL REDUCING AGENT.
Inventors
- 👤 R Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:44
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6536; C07F9/6539; C07C; C07C45/00; C07C45/51; C07C45/511; C07C45/515; C07C47/00; C07C47/02; C07C47/12; C07C51/00; C07C51/42; C07C51/487; C07C51/493; C07D; C07D277/00; C07D277/02; C07D277/04; C07D277/06; C07D499/00; C07F9/28; C07F9/50; C07F9/53; C07F9/54; C07F9/5463
Claims Analysis
Total Claims: 0
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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) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |