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Patent US3666830A successfully refreshed from Google Patents.
US3666830A
Expired / Lapsed
US
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Lead compound catalyzed siloxane resin system
Assignee: General Electric Co
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Filing: 1971-01-21
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Granted: 1972-05-30
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Expires: 1991-01-21
Abstract
Abstract A molding compound contains an uncured siloxane resin, a lead containing catalyst, and a silane or polysiloxane containing an appreciable amount of silanol or alkoxy groups. The molding compound is relatively stable at flow temperatures but cures rapidly at molding temperatures. The molding compound is used in the transfer molding of transistor housings.
Inventors
- 👤 Alvin J Alekna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:49
CPC Classifications
H; H10; H10W; H10W74/00; H10W74/40; H10W74/47; H10W74/476; C; C08; C08L; C08L83/00; C08L83/04; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/46; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/16; C08G77/18; C08G77/20; C08G77/22; C08G77/24; C08G77/70
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
256 words
from one-half to 10 percent by weight based upon the total weight of (a) + (b) of a compound, other than the resin, selected from the class consisting of i. a silane of the formula, Rt(OH)u(OR)vSi where R is selected from the class consisting of lower alkyl radicals having one to eight carbon atoms; cycloalkyl radicals having five to seven carbon atoms in the riNg; lower alkenyl radicals having two to eight carbon atoms; mononuclear aryl radicals; mononuclear aryl lower alkyl radicals having one to six carbon atoms in the alkyl group; and halogenated derivatives of the above radicals; OR is a lower alkoxy radical containing from one to eight carbon atoms per radical; t has a value of 1 to 3; u has a value of 0 to 3, v has a value of 0 to 3; and the sum of u + v has a value of 1 to 3; ii. a siloxane compound having the average unit formula, R2x(HO)y(OR)2zSiO(4 x y z)/2 where R2 and (OR)2 are defined as R and (OR), respectively are defined above; x has a value of 1 to 3 and when x has a value of less than 1.7, there are at least 5 percent by weight based upon the weight of the siloxane compound of HO and (OR)2 groups in the siloxane compound; y has a value of 0 to 2; z has a value of 0 to 2, and the sum of y + z has a value of 0.02 to 2, and (c) a filler.
Claim 2
Dependent Claim
10 words
The composition of claim 1, wherein (b) contains lead carbonate.
Claim 3
Dependent Claim
31 words
The composition of claim 1, wherein q has a value of 0.2 to 0.55; r has a value of 0.2 to 0.55; and s has a value of 1.05 to 1.45.
Claim 4
Dependent Claim
19 words
The composition of claim 1, wherein the sum of q + r has a value of 0.2 to 0.55.
Claim 5
Dependent Claim
28 words
The composition of claim 1, wherein the resin contains from 4 to 11 percent of silicon-bonded groups selected from the class consisting of hydroxyl groups and alkoxy groups.
Claim 6
Dependent Claim
29 words
The composition of claim 1, wherein the resin contains from 5 to 7 percent by weight of groups selected from the class consisting of hydroxy and lower alkoxy groups.
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |