Patent US649572A successfully refreshed from Google Patents.
Patent US3189662A successfully refreshed from Google Patents.
US3189662A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organopolysiloxane-polycarbonate block copolymers
Assignee: General Electric Co
•
Filing: 1961-01-23
•
Granted: 1965-06-15
•
Expires: 1981-01-23
Abstract
No abstract record available.
Inventors
- 👤 Jr Howard A Vaughn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:18
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/42; C08G77/448; C08G64/00; C08G64/18; C08G64/186
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
BLOCK COPOLYMERS OF (A) FROM 10 TO 75 PERCENT BY WEIGHT OF A POLYDIORGANOSILOXANE COMPOSED OF FROM ABOUT 5 TO ABOUT 200 CHEMICALLY COMBINED DIORGANOSILOXY UNITS CONSISTING ESSENTIALLY OF DIALKYLSILOXY UNITS WHICH ARE CONNECTED TO EACH OTHER BY SILICON-OXYGEN-SILICON LINKAGES WHEREIN EACH OF THE SILICON ATOMS HAS TWO ORGANO RADICALS ATTACHED THROUGH A CARBON-SILICON BOND AND (B) FROM 90 TO 25 PERCENT BY WEIGHT OF AN INTERCONDENSATION PRODUCT OF A DIHYDRIC PHENOL AND A CARBONYL HALIDE, WHERE SAID POLYDIORGANOSILOXANE AND SAID INTERCONDENSATION PRODUCT ARE JOINED BY ARYLOXY-SILICON LINKAGES.
Claim 2
Dependent Claim
88 words
BLOCK COPOLYMERS OF (A) FROM 10 TO 75 PERCENT BY WEIGHT OF A POLYDIORGANOSILOXANE COMPOSED OF FROM ABOUT 5 TO ABOUT 200 CHEMICALLY COMBINED DIORGANOSILOXY UNITS CONSISTING ESSENTIALLY OF DIALKYLSILOXY UNITS WHICH ARE CONNECTED TO EACH OTHER BY SILICON-OXYGEN-SILICON LINKAGES WHEREIN EACH OF THE SILICON ATOMS HAS TWO ORGANO RADICALS ATTACHED THROUGH A CARBON-SILICON BOND AND (B) FROM 90 TO 25 PERCENT BY WEIGHT OF AN INTERCONDENSATION PRODUCT OF A DIHYDRIC PHENOL AND A CARBONYL HALIDE, WHERE SAID POLYDIORGANOSILOXANE AND SAID INTERCONDENSATION PRODUCT ARE JOINED BY ARYLOXY-SILICON LINKAGES.
References Cited (Backward Citations)
FR1198715A
Cited
US2999845A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-14 | 1968-12-14 | 1969-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-14 | 1972-12-14 | 1973-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-14 | 1976-12-14 | 1977-06-15 | $7700.00 | Window Closed / Lapsed |