US3787359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous manufacture of high molec-ular weight linear polycarbonates
Assignee: BASF SE
•
Filing: 1972-01-11
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Granted: 1974-01-22
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Expires: 1992-01-11
Abstract
Abstract CONTINUOUS MANUFACTURE OF HIGH MOLECULAR WEIGHT LINEAR POLYCARBONATES OF HIGH PURITY FROM ORGANIC DIHYDROXY COMPOUNDS AND PHOSGENE IN ONE OR MORE PACKED REACTORS, WHEREIN THE REACTION IS CARRIED OUT UNDER "TRANSITION FLOW" CONDITIONS, CONVENIENTLY WITH RECYCLING OF THE REACTION MIXTURE.
Inventors
- 👤 P Horn
- 👤 H Joschek
- 👤 L Schuster
- 👤 G Falkenstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:35
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/20; C08G64/22; C08G64/24; C08G64/205
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |