US3346515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing alternating ether-siloxane copolymers
Assignee: Individual
•
Filing: 1965-11-02
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Granted: 1967-10-10
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Expires: 1985-11-02
Abstract
No abstract record available.
Inventors
- 👤 James E Curry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:09
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A METHOD OF PRODUCING ALTERNATING ETHER-SILOXANE COPOLYMERS WHICH COMPRISES; (A) ADMIXING A DIAMINOSILANE MONOMER HAVING THE FORMULA R1 R2 SI (NHR3) (NHR4) WHEREIN R1, R2, R3, AND R4 ARE ARYL GROUPS AND A DIOL MONOMER SELECTED FROM THE GROUP CONSISTING OF HYDROQUINONE, P, P''-BIPHENOL, 2, 7-NAPHTHALENE DIOL, 2, 2-PROPENE-BIS-(4HYDROXYBENZENE), 1, 6-HEXANEDIOL, AND 4, 4''-DIHYDROXYDIPHENYL ETHER. (B) HEATING THE RESULTING MIXTURE TO A TEMPERATURE OF ABOUT 300* TO 325*C.; AND (C) DWELLING AT SAID TEMPERATURE FOR A PERIOD OF ABOUT 4 TO 7 HOURS UNDER A VACUUM, WHEREBY RELATIVELY HIGHMOLECULAR-WEIGHT COPOLYMERS ARE OBTAINED.
Claim 2
Independent Claim
92 words
A METHOD OF PRODUCING ALTERNATING ETHER-SILOXANE COPOLYMERS WHICH COMPRISES; (A) ADMIXING A DIAMINOSILANE MONOMER HAVING THE FORMULA R1 R2 SI (NHR3) (NHR4) WHEREIN R1, R2, R3, AND R4 ARE ARYL GROUPS AND A DIOL MONOMER SELECTED FROM THE GROUP CONSISTING OF HYDROQUINONE, P, P''-BIPHENOL, 2, 7-NAPHTHALENE DIOL, 2, 2-PROPENE-BIS-(4HYDROXYBENZENE), 1, 6-HEXANEDIOL, AND 4, 4''-DIHYDROXYDIPHENYL ETHER. (B) HEATING THE RESULTING MIXTURE TO A TEMPERATURE OF ABOUT 300* TO 325*C.; AND (C) DWELLING AT SAID TEMPERATURE FOR A PERIOD OF ABOUT 4 TO 7 HOURS UNDER A VACUUM, WHEREBY RELATIVELY HIGHMOLECULAR-WEIGHT COPOLYMERS ARE OBTAINED.
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) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |