US3211775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic process for preparing aromatic chloroformates
Assignee: EIDP Inc
•
Filing: 1963-01-22
•
Granted: 1965-10-12
•
Expires: 1983-01-22
Abstract
No abstract record available.
Inventors
- 👤 Stephens Curtis Wayne
- 👤 Sweeny Wilfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:53
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/96; C07C68/00; C07C68/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A PROCESS FOR PREPARING AN AROMATIC ESTER OF CHLOROFORMIC ACID WHICH CONSISTS ESSENTIALLY OF REACTING AT AN ELEVATED TEMPERATURE OF BETWEEN ABOUT 70* AND 180*C. AND AT SUPERATMOSPHERIC PRESSURE, PHOSGENE WITH A PHENOL THAT IS FREE OF OTHER NUCLEAR SUBSTITUENTS THAT ARE REACTAIVE UNDER THE CONDITIONS OF CONDENSATION EMPLOYED, IN THE PRESENCE OF A SYNTHETIC POLYMERIC RESIN CATALYST CONTAINING AS THE FUNCTIONAL PORTION THEREOF A PLURALITY OF GROUPS SELECTED FROM THE CLASS CONSISTING OF SECONDARY AND TERTIARY AMINO GROUPS AND THE SALTS THEREOF. THE SAID RESINS BEING INSOLUBLE UNDER THE REACTION CONDITIONS, AND BEING PRESENT IN A QUANTITY TO PROVIDE A PHENOLIC COMPOUND TO RESIN CATALYST WEIGHT RATIO OF FROM ABOUT 0.5 TO 30 PARTS OF PHENOLIC COMPOUND PER PART OF RESIN CATALYST.
Claim 2
Dependent Claim
123 words
A PROCESS FOR PREPARING AN AROMATIC ESTER OF CHLOROFORMIC ACID WHICH CONSISTS ESSENTIALLY OF REACTING AT AN ELEVATED TEMPERATURE OF BETWEEN ABOUT 70* AND 180*C. AND AT SUPERATMOSPHERIC PRESSURE, PHOSGENE WITH A PHENOL THAT IS FREE OF OTHER NUCLEAR SUBSTITUENTS THAT ARE REACTAIVE UNDER THE CONDITIONS OF CONDENSATION EMPLOYED, IN THE PRESENCE OF A SYNTHETIC POLYMERIC RESIN CATALYST CONTAINING AS THE FUNCTIONAL PORTION THEREOF A PLURALITY OF GROUPS SELECTED FROM THE CLASS CONSISTING OF SECONDARY AND TERTIARY AMINO GROUPS AND THE SALTS THEREOF. THE SAID RESINS BEING INSOLUBLE UNDER THE REACTION CONDITIONS, AND BEING PRESENT IN A QUANTITY TO PROVIDE A PHENOLIC COMPOUND TO RESIN CATALYST WEIGHT RATIO OF FROM ABOUT 0.5 TO 30 PARTS OF PHENOLIC COMPOUND PER PART OF RESIN CATALYST.
References Cited (Backward Citations)
US2591573A
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 |