Patent US3202634A successfully refreshed from Google Patents.
US3202634A
Expired / Lapsed
US
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Silarylenesiloxane block copolymers
Assignee: Dow Silicones Corp
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Filing: 1960-08-24
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Granted: 1965-08-24
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Expires: 1980-08-24
Abstract
No abstract record available.
Inventors
- 👤 Robert L Merker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:02
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/48; C08G77/50; C08G77/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A SOLUBLE ORGANOSILOXANE BLOCK COPOLYMER EXHIBITING POLYMERIC CRYSTALLINITY AT 25*C. AND IN WHICH THE COPOLYMERIC MOLECULES CONSIST ESSENTIALLY OF (A) AMORPHOUS SEGMENTS CONSISTING OF LINKED REPEATING UNITS OF THE FORMULA R''2SIO HAVING AN AVERAGE MINIMUM NUMBER OF AT LEAST 10 UNITS OF R''2SIO AND (B) CRYSTALLITE SEGMENTS CONSISTING OF LINKED REPEATING UNITS OF THE FORMULA -SI(R)2Z(R)2SIO- HAVING AN AVERAGE MINIMUM NUMBER OF AT LEAST 3 UNITS OF -SI(R)2Z(R)2SIO-, WHERE EACH R'' IS SELECTED FROM THE GROUP CONSISTING OF MONOVALENT HYDROCARBON RADICALS, EACH R IS A MONOVALENT HYDROCARBON RADICAL FREE OF ALIPHATIC UNSATURATION AND Z IS A DIVALENT RADICAL SELECTED FROM THE GROUP CONSISTING OF PH-PHENYLENE, 4,4''-BIPHENYLENE, 4,4''-DIPHENYLENE ETHER, 4,4''-DIMETHYLENE BENZENE, AND 4,4''-DIMETHYLELEDIPHENYL ETHER RADICALS, THE MOLAR RATIO OF TOTAL R''2SIO UNITS TO TOTAL -SI(R)2Z(R)2SIO- UNITS RANGING FROM 10:90 TO 95:59
Claim 2
Dependent Claim
130 words
A SOLUBLE ORGANOSILOXANE BLOCK COPOLYMER EXHIBITING POLYMERIC CRYSTALLINITY AT 25*C. AND IN WHICH THE COPOLYMERIC MOLECULES CONSIST ESSENTIALLY OF (A) AMORPHOUS SEGMENTS CONSISTING OF LINKED REPEATING UNITS OF THE FORMULA R''2SIO HAVING AN AVERAGE MINIMUM NUMBER OF AT LEAST 10 UNITS OF R''2SIO AND (B) CRYSTALLITE SEGMENTS CONSISTING OF LINKED REPEATING UNITS OF THE FORMULA -SI(R)2Z(R)2SIO- HAVING AN AVERAGE MINIMUM NUMBER OF AT LEAST 3 UNITS OF -SI(R)2Z(R)2SIO-, WHERE EACH R'' IS SELECTED FROM THE GROUP CONSISTING OF MONOVALENT HYDROCARBON RADICALS, EACH R IS A MONOVALENT HYDROCARBON RADICAL FREE OF ALIPHATIC UNSATURATION AND Z IS A DIVALENT RADICAL SELECTED FROM THE GROUP CONSISTING OF PH-PHENYLENE, 4,4''-BIPHENYLENE, 4,4''-DIPHENYLENE ETHER, 4,4''-DIMETHYLENE BENZENE, AND 4,4''-DIMETHYLELEDIPHENYL ETHER RADICALS, THE MOLAR RATIO OF TOTAL R''2SIO UNITS TO TOTAL -SI(R)2Z(R)2SIO- UNITS RANGING FROM 10:90 TO 95:59
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |