US3676420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Room temperature vulcanizable silicone rubber composition
Assignee: Midland Silicones Ltd
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Filing: 1970-04-15
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Granted: 1972-07-11
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Expires: 1990-04-15
Abstract
Abstract A two package room-temperature vulcanizable silicone rubber stock comprising (1) an Alpha , omega dihydroxydiorganopolysiloxane polymer and (2) a mixture of (a) a crosslinking agent selected from trialkoxysilanes, tetraalkoxysilanes and alkylpolysilicates, (b) a condensation catalyst and (c) an alkoxy endblocked diorganopolysiloxane.
Inventors
- 👤 Michael Fulton
- 👤 John Darrell Jones
- 👤 Christopher A Pearce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:17
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/02; C08G77/04; C08G77/14; C08G77/16; C08G77/22; C08G77/24; C08G77/26; Y; Y10; Y10S; Y10S524/00; Y10S524/906; Y10S528/00; Y10S528/901
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
28 words
A process as claimed in claim 1 wherein the diorganopolysiloxane (1) is a dimethylpolysiloxane having a viscosity within the range from 500 to 40,000 cs. at 25* C.
Claim 2
Dependent Claim
19 words
A process as claimed in claim 1 wherein the condensation catalyst is a tin salt of a carboxylic acid.
Claim 3
Dependent Claim
25 words
A process as claimed in claim 1 wherein the polydiorganosiloxane (4) has a viscosity within the range from 20 to 4,000 cs. at 25* C.
Claim 4
Dependent Claim
31 words
A process as claimed in claim 1 wherein the preparation also contains a filler, at least a major proportion of the said filler being present in admixture with the diorganopolysiloxane (1).
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |