US3607899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of trimethylsilyl-endblocked trifluoropropylmethylpolysiloxanes
Assignee: Dow Silicones Corp
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Filing: 1969-09-29
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Granted: 1971-09-21
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Expires: 1989-09-29
Abstract
Abstract Trimethylsilyl-endblocked trifluoropropylmethylpolysiloxanes are produced by the acid-clay catalyzed reaction of the trifluoropropylmethylcyclotrisiloxane with a trimethylsilylendblocker.
Inventors
- 👤 Eric D Brown
- 👤 Loren A Haluska
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:49
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01G4/22; H01G4/221; H01G4/222; C; C08; C08G; C08G77/00; C08G77/04; C08G77/22; C08G77/24; C10; C10M; C10M107/00; C10M107/50; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/46; H01B3/465; C10M2229/00; C10M2229/04; C10M2229/05; C10M2229/051; C10M2229/0515; C10N; C10N2030/00; C10N2030/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
29 words
The method of claim 1 wherein the catalyst (3) is present in amount equal to at least 1 weight percent, based on the weight of reactants (1) and (2).
Claim 2
Dependent Claim
10 words
The method of claim 2 wherein siloxane (2) is hexamethyldisiloxane.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein the temperature of step (b) is maintained at from 130*-135* C.
Claim 4
Dependent Claim
19 words
The method of claim 1 including the subsequent step (c) of filtering the reaction mixture to remove the clay.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |