US3211774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing aromatic esters of chloroformic acid
Assignee: EIDP Inc
•
Filing: 1963-01-22
•
Granted: 1965-10-12
•
Expires: 1983-01-22
Abstract
No abstract record available.
Inventors
- 👤 Stephens Curtis Wayne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:12
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/96; C07C68/00; C07C68/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A PROCESS FOR PREPARING AN AROMATIC ESTER OF CHLOROFORMIC ACID WHICH COMPRISES REACTING PHOSGENE WITHG A PHENOL IN THE PRESENCE OF A CATALYTIC AMOUNT OF FROM 0.5% TO 10% BY WEIGHT OF THE PHENOL OF A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
40 words
A PROCESS FOR PREPARING AN AROMATIC ESTER OF CHLOROFORMIC ACID WHICH COMPRISES REACTING PHOSGENE WITHG A PHENOL IN THE PRESENCE OF A CATALYTIC AMOUNT OF FROM 0.5% TO 10% BY WEIGHT OF THE PHENOL OF A COMPOUND OF THE FORMULA
References Cited (Backward Citations)
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Cited
US2370570A
Cited
US2370571A
Cited
US2455652A
Cited
GB808490A
Cited
US2973291A
Cited
US3149155A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-11 | 1969-04-12 | 1969-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-11 | 1973-04-12 | 1973-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-11 | 1977-04-12 | 1977-10-12 | $7700.00 | Window Closed / Lapsed |