US3207777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycarbonates of polyhydroxy-perchlorobiphenyls
Assignee: Societe dElectro Chimie dElectro Metallurgie et des Acieries Electriques Dugine SA SECEMAU
•
Filing: 1962-10-30
•
Granted: 1965-09-21
•
Expires: 1982-10-30
Abstract
No abstract record available.
Inventors
- 👤 Szobel Laszlo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:38
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/08; C08G64/10; C07; C07C; C07C37/00; C07C37/01; C07C37/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A POLYCARBONATE OF POLYHYDROXYPERCHLOROBIPHENYL OBTAINED BY THE REACTION BETWEEN PHOSGENE AND POLYHYDROXYPERCHLOROBIPHENYL AT A TEMPERATURE BETWEEN 5*C. AND 30*C. IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF TOLUENE AND METHYLENE CHLORIDE IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTIN OF A QUATERNARY AMMONIUM SALT, A TERTIARY AMINE, SAID POLYHYDROXYPERCHLOROBIPHENYL HAVING THE FORMULA
Claim 2
Dependent Claim
56 words
A POLYCARBONATE OF POLYHYDROXYPERCHLOROBIPHENYL OBTAINED BY THE REACTION BETWEEN PHOSGENE AND POLYHYDROXYPERCHLOROBIPHENYL AT A TEMPERATURE BETWEEN 5*C. AND 30*C. IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF TOLUENE AND METHYLENE CHLORIDE IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTIN OF A QUATERNARY AMMONIUM SALT, A TERTIARY AMINE, SAID POLYHYDROXYPERCHLOROBIPHENYL HAVING THE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |