Patent US3119787A successfully refreshed from Google Patents.
US3119787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Block copolymers of polycarbonates
Assignee: —
•
Filing: —
•
Granted: 1964-01-28
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Expires: 1981-01-28
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:40
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/08; C08G64/10; C08G65/00; C08G65/34; C08G65/38; C08G65/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
AN IMPROVED POLYCARBONATE OF 2,2-BIS(3,5-DICHLORO4-HYDROXYPHENYL) PROPANE CONSISTING OF A HIGHLY POLYMERIC BLOCK COPOLYMER HAVING AN INHERENT VISCOSITY OF FROM ABOUT 0.5 TO ABOUT 3.5 ESSENTIALLY COMPOSED OF ALTERNATING BLOCKS HAVING THE STRUCTURE: I. BLOCKS CHARACTERIZED IN THAT THESE BLOCKS AS AN INDEDEPENDENT POLYMER WOULD HAVE AN INHERENT VISCOSITY OF AT LEASST 0.05 MEASURED IN CHLOROFORM AND BE COMPOSED OF FROM ABOUT 3 TO ABOUT 50 RECURRING UNITS HAVING THE FOLLOWING FORMULA (A):
Claim 2
Dependent Claim
72 words
AN IMPROVED POLYCARBONATE OF 2,2-BIS(3,5-DICHLORO4-HYDROXYPHENYL) PROPANE CONSISTING OF A HIGHLY POLYMERIC BLOCK COPOLYMER HAVING AN INHERENT VISCOSITY OF FROM ABOUT 0.5 TO ABOUT 3.5 ESSENTIALLY COMPOSED OF ALTERNATING BLOCKS HAVING THE STRUCTURE: I. BLOCKS CHARACTERIZED IN THAT THESE BLOCKS AS AN INDEDEPENDENT POLYMER WOULD HAVE AN INHERENT VISCOSITY OF AT LEASST 0.05 MEASURED IN CHLOROFORM AND BE COMPOSED OF FROM ABOUT 3 TO ABOUT 50 RECURRING UNITS HAVING THE FOLLOWING FORMULA (A):
References Cited (Backward Citations)
US2970131A
Cited
GB772627A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-27 | 1967-07-29 | 1968-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-27 | 1971-07-29 | 1972-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-27 | 1975-07-29 | 1976-01-28 | $7700.00 | Window Closed / Lapsed |