Patent EP1503336A2 successfully refreshed from Google Patents.
Patent US3220973A successfully refreshed from Google Patents.
US3220973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-linked polycarbonate resinous compositions
Assignee: —
•
Filing: —
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Granted: 1965-11-30
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Expires: 1982-11-30
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:15
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/14; C08G64/08; C08G64/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A HIGH MOLECULAR WEIGHT, CROSS-LINED POLYCARBONATE RESIN PREPARED BY HEATING AT A TEMPERATURE ABOVE 180*C., A CARBONATE POLYMER OF REACTANTS CONSISTING ESSENTIALLY OF (1) A CARBONATE PRECURSOR SELECTED FROM THE CLASS CONSISTING OF CARBONATE ESTERS AND CARBONYL HALIDES, (2) A DIHYDRIC PHENOL IN WHICH THE HYDROXYL GROUPS ARE THE SOLE REACTIVE GROUPS, AND (3) A MATERIAL SELECTED FROM THE CLASS CONSISTING OF ALIPHATIC POLYOLS, ALIPHATIC AMINO ALCOHOLS, ALIPHATIC DIAMINES AND MIXTURES THEREOF, SAID MATERIAL HAVING A FUNCTIONALITY OF AT LEAST THREE PROVIDED BY A HYDROXYL AND AMINO GROUPS AND BEING PRESENTED IN AN AMOUNT RANGING FROM 1 TO 75 MOLE PERCENT BASED ON THE TOTAL MOLES OF DIHYDRIC PHENOL IN SAID MATERIAL.
Claim 2
Dependent Claim
112 words
A HIGH MOLECULAR WEIGHT, CROSS-LINED POLYCARBONATE RESIN PREPARED BY HEATING AT A TEMPERATURE ABOVE 180*C., A CARBONATE POLYMER OF REACTANTS CONSISTING ESSENTIALLY OF (1) A CARBONATE PRECURSOR SELECTED FROM THE CLASS CONSISTING OF CARBONATE ESTERS AND CARBONYL HALIDES, (2) A DIHYDRIC PHENOL IN WHICH THE HYDROXYL GROUPS ARE THE SOLE REACTIVE GROUPS, AND (3) A MATERIAL SELECTED FROM THE CLASS CONSISTING OF ALIPHATIC POLYOLS, ALIPHATIC AMINO ALCOHOLS, ALIPHATIC DIAMINES AND MIXTURES THEREOF, SAID MATERIAL HAVING A FUNCTIONALITY OF AT LEAST THREE PROVIDED BY A HYDROXYL AND AMINO GROUPS AND BEING PRESENTED IN AN AMOUNT RANGING FROM 1 TO 75 MOLE PERCENT BASED ON THE TOTAL MOLES OF DIHYDRIC PHENOL IN SAID MATERIAL.
References Cited (Backward Citations)
DE17166C
Cited
US2789967A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |