US3083182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the catalytic pkobuctiqn
Assignee: —
•
Filing: —
•
Granted: 1963-03-26
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Expires: 1980-03-26
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:32
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/20; C08G64/30; C08G64/307; C07; C07C; C07C69/00; C07C69/96
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A PROCESS FOR PRODUCING POLYCARBONATE WHICH COMPRISES REACTING AT LEAST ONE 4.4''-DIHYDROXY-DIARYL-ALKANE IN WICH BOTH OF THE HYDROXY-ARYL GROUPS ARE ATTACHED TO THE SAME CARBON ATOM OF THE ALKANE WITH AT LEAST ONE DIARYL CARBONATE IN THE PRESENCE OF AT LEAST ONE MANGANESE COMPOUND SELECTED FROM THE GROUP CONSISTING OF MANGANESE SALTS OF OGANIC ACIDS, BORIC ACID, AND CARBONIC ACID, SAID REACTION BEING CARRIED OUT AT A TEMPERATURE OF AT LEAST 160*C. UNDER A PRESSURE OF LESS THAN 50 MM. HG, THE AMOUNT OF SAID DIARYL CARBONATE BEING AT LEAST 1 MOL WITH RESPECT TO 1 MOL OF SAID 4,4''-DIHYDROXY-DIARYL-ALKANE AND THE AMOUNT OF SAID MANGANESE COMPOUND BEING 0.0012.0% BY WEIGHT OF SAID 4,4-DIHYDROXY-DIARYL-ALKANE.
Claim 2
Dependent Claim
114 words
A PROCESS FOR PRODUCING POLYCARBONATE WHICH COMPRISES REACTING AT LEAST ONE 4.4''-DIHYDROXY-DIARYL-ALKANE IN WICH BOTH OF THE HYDROXY-ARYL GROUPS ARE ATTACHED TO THE SAME CARBON ATOM OF THE ALKANE WITH AT LEAST ONE DIARYL CARBONATE IN THE PRESENCE OF AT LEAST ONE MANGANESE COMPOUND SELECTED FROM THE GROUP CONSISTING OF MANGANESE SALTS OF OGANIC ACIDS, BORIC ACID, AND CARBONIC ACID, SAID REACTION BEING CARRIED OUT AT A TEMPERATURE OF AT LEAST 160*C. UNDER A PRESSURE OF LESS THAN 50 MM. HG, THE AMOUNT OF SAID DIARYL CARBONATE BEING AT LEAST 1 MOL WITH RESPECT TO 1 MOL OF SAID 4,4''-DIHYDROXY-DIARYL-ALKANE AND THE AMOUNT OF SAID MANGANESE COMPOUND BEING 0.0012.0% BY WEIGHT OF SAID 4,4-DIHYDROXY-DIARYL-ALKANE.
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) | 1966-03-25 | 1966-09-24 | 1967-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-25 | 1970-09-24 | 1971-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-25 | 1974-09-24 | 1975-03-26 | $7700.00 | Window Closed / Lapsed |