US3223678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chain shortening of polycarbonate resins using monoethanolamine or morpholine as the shortening agent
Assignee: Armstrong World Industries Inc
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Filing: 1964-12-07
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Granted: 1965-12-14
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Expires: 1984-12-07
Abstract
No abstract record available.
Inventors
- 👤 Nicholas C Bolgiano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:05
CPC Classifications
C; C08; C08G; C08G64/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
THE METHOD OF CONVERTING A POLYCARBONATE WHICH WILL NOT FORM A FILM ON DRYING AN EMULSION THEREOF TO A POLYCARBONATE WHICH WILL FORM SUCH A FILM BY REDUCING THE MOLECULAR WEIGHT OF THE POLYCARBONATE IN A CONTROLLED MANNER WHICH COMPRISES DISSOLVING IN AN INERT SOLVENT THEREFOR A POLYCARBONATE WHICH IS THE REACTION PRODUCT OF PHOSGENE AND A BIS-PHENOL SELECTED FROM THE GROUP CONSISTING OF 2,2-BIS-(4 HYDROXYL PHENYL) PROPANE, THE METHYL ESTER OF 4,4-BIS-(4 HYDROXYL PHENYL) PENTANOIC ACID, THE ETHYL ESTER THEROF, AND THE BUTYL ESTER THEREOF, ADDING TO THE RESULTING SOLUTION AN ORGANIC AMINE SELECTED FROM THE GROUP CONSISTING OF MONOETHANOLAMINE AND MORPHOLINE IN AN AMOUNT OF 0.1-20% BY WEIGHT OF THE POLYCARBONATE-AMINE MIXTURE, THEREBY CAUSING CHAIN SCISSION OF SAID POLYCARBONATE.
Claim 2
Independent Claim
121 words
THE METHOD OF CONVERTING A POLYCARBONATE WHICH WILL NOT FORM A FILM ON DRYING AN EMULSION THEREOF TO A POLYCARBONATE WHICH WILL FORM SUCH A FILM BY REDUCING THE MOLECULAR WEIGHT OF THE POLYCARBONATE IN A CONTROLLED MANNER WHICH COMPRISES DISSOLVING IN AN INERT SOLVENT THEREFOR A POLYCARBONATE WHICH IS THE REACTION PRODUCT OF PHOSGENE AND A BIS-PHENOL SELECTED FROM THE GROUP CONSISTING OF 2,2-BIS-(4 HYDROXYL PHENYL) PROPANE, THE METHYL ESTER OF 4,4-BIS-(4 HYDROXYL PHENYL) PENTANOIC ACID, THE ETHYL ESTER THEROF, AND THE BUTYL ESTER THEREOF, ADDING TO THE RESULTING SOLUTION AN ORGANIC AMINE SELECTED FROM THE GROUP CONSISTING OF MONOETHANOLAMINE AND MORPHOLINE IN AN AMOUNT OF 0.1-20% BY WEIGHT OF THE POLYCARBONATE-AMINE MIXTURE, THEREBY CAUSING CHAIN SCISSION OF SAID POLYCARBONATE.
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) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |