US3915924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optically clear void filling compound
Assignee: General Electric Co
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Filing: 1974-12-18
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Granted: 1975-10-28
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Expires: 1994-12-18
Abstract
Abstract There is provided an optically clear void filling compound for filling voids where it is necessary to have at least 80% of the electromagnetic waves striking the void to pass there through by having a diorganopolysiloxane polymer having a viscosity of anywhere from 100 to 100,000 centipoise at 25*C where the organo groups are methyl and phenyl and the total phenyl content varies from 29 to 34 percent and there is incorporated into the diorganopolysiloxane a filler at a concentration of 4 percent to 20 percent by weight of said diorganopolysiloxane and said filler is selected from the class consisting of untreated fumed silica and untreated precipitated silica. The use of the filler in the compound imparts to it consistency.
Inventors
- 👤 John H Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:07
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36; C08L; C08L71/00; C08L71/02; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/16; C08G77/70
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
95 words
AN OPTICALLY CLEAR VOID FILLING COMPOUND THAT ALLOWS AT EAST 80 PERCENT OF THE ELECTROMAGNETIC WAVES STRIKING IT TO PASS THERETHROUGH COMPRISING A POLYDIORGANOSILOXANE POLYMER AND BLENDS OF POLYDIORGANOSILOXANE POLYMER HAVING A VISCOSITY OF 100 TO 100,000 CENTIPOISE AT 25*C, WHERE HE ORGANO GROUPS ARE METHYL AND PHENYL AND THE TOTAL PHENYL CONTENT VARIES FROM 29 PERCENT TO 34 PERCENT BY WEIGHT AND FROM 4 PERCENT TO 20 PERCENT BY WEIGHT OF SAID ORGANOPOLYSILOXANE POLYMER AND BLENDS OF POLYMERS OF A FILLER SELECTED FROM THE CLASS CONSISTING OF UNTREATED FUMED SILICA AND UNTREATED PRECIPITATED SILICA.
Claim 2
Dependent Claim
95 words
AN OPTICALLY CLEAR VOID FILLING COMPOUND THAT ALLOWS AT EAST 80 PERCENT OF THE ELECTROMAGNETIC WAVES STRIKING IT TO PASS THERETHROUGH COMPRISING A POLYDIORGANOSILOXANE POLYMER AND BLENDS OF POLYDIORGANOSILOXANE POLYMER HAVING A VISCOSITY OF 100 TO 100,000 CENTIPOISE AT 25*C, WHERE HE ORGANO GROUPS ARE METHYL AND PHENYL AND THE TOTAL PHENYL CONTENT VARIES FROM 29 PERCENT TO 34 PERCENT BY WEIGHT AND FROM 4 PERCENT TO 20 PERCENT BY WEIGHT OF SAID ORGANOPOLYSILOXANE POLYMER AND BLENDS OF POLYMERS OF A FILLER SELECTED FROM THE CLASS CONSISTING OF UNTREATED FUMED SILICA AND UNTREATED PRECIPITATED SILICA.
Claim 3
Dependent Claim
33 words
The compound of claim 1 where the filler has a surFace area of 100 to 500 square meters per gram and a silanol content of from 0.25 percent to 1 percent by weight.
Claim 4
Dependent Claim
30 words
The compound of claim 1 wherein the filler is present at a concentration range of 5 percent to 15 percent by weight of the diorganopolysiloxane polymer and blends of polymers.
Claim 5
Dependent Claim
30 words
The compound of claim 1 wherein the diorganopolysiloxane polymer and blends of polymers have the formula, RaSiO4-a/2, where R is methyl and phenyl, and a varies from 1.9 to 2.1.
Claim 6
Dependent Claim
46 words
The compound of claim 4 wherein the viscosity of the polysiloxane polymer and blends of polysiloxane polymers varies from 300 to 10,000 centipoise at 25*C and there is present in the polymer or blends of polymers 29.5 percent to 32.0 percent by weight of phenyl radicals.
Claim 7
Dependent Claim
60 words
The compound of claim 1 wherein there is present, based on weight of said polysiloxane polymer and blends of polymers, 0.05 percent to 1 percent by weight of stabilizer which is a polyether having oxyalkylene groups selected from the class consisting of ethylene oxide and propylene oxide and mixtures thereof, and a refractive index that varies from 1.459 to 1.467.
Claim 8
Dependent Claim
20 words
The compound of claim 6 wherein the concentration of said stabilizer varies from 0.1 percent to 0.3 percent by weight.
Claim 9
Dependent Claim
37 words
The compound of claim 1 wherein the blend of diorganopolysiloxane polymers comprises polymers having a phenyl content as low as 5 percent by weight and polymers having a phenyl content as high as 50 percent by weight.
Claim 10
Dependent Claim
102 words
A process for making an optically clear void filling compound that allows at least 80 percent of the electromagnetic waves striking it to pass therethrough comprising mixing a filler selected from the class consisting of untreated fumed silica and untreated precipitated silica into a diorganopolysiloxane polymer and blends of polysiloxane polymers having a viscosity of 100 to 100,000 centipoise at 25*C where the organo groups are methyl and phenyl and the total phenyl content varies from 29 percent to 34 percent by weight and said filler comprises 4 percent to 20 percent by weight of said organopolysiloxane polymer and blends of polymers
Claim 11
Dependent Claim
102 words
A process for making an optically clear void filling compound that allows at least 80 percent of the electromagnetic waves striking it to pass therethrough comprising mixing a filler selected from the class consisting of untreated fumed silica and untreated precipitated silica into a diorganopolysiloxane polymer and blends of polysiloxane polymers having a viscosity of 100 to 100,000 centipoise at 25*C where the organo groups are methyl and phenyl and the total phenyl content varies from 29 percent to 34 percent by weight and said filler comprises 4 percent to 20 percent by weight of said organopolysiloxane polymer and blends of polymers
Claim 12
Dependent Claim
33 words
The process of claim 9 where the filler has a surface area of 100 to 500 square meters per gram and a silanol content of from 0.25 percent to 1 percent by weight.
Claim 13
Dependent Claim
29 words
The process of claim 9 wherein the filler is present at a concentration of 5 percent to 15 percent by weight of the diorganopolysiloxane polymer and blends of polymers.
Claim 14
Dependent Claim
30 words
The process of claim 9 wherein the diorganopolysiloxane polymer and blends of polymers have the formula, RaSiO4-a/2, where R is methyl and phenyl and a varies from 1.9 to 2.1.
Claim 15
Dependent Claim
45 words
The process of claim 12 wherein the viscosity of the polymer and blends of polysiloxane polymers varies from 300 to 10,000 centipoise at 25*C and there is present in such polymers and blends of polymers 29.5 percent to 32.0 percent by weight of phenyl radicals.
Claim 16
Dependent Claim
63 words
The process of claim 9 further comprising adding to the mixture, based on the weight of said polysiloxane polymer and blends of polymers, 0.05 percent to 1 percent by weight of a stabilizer which is a polyether having oxyalkylene groups selected from the class consisting of ethylene oxide, propylene oxide and mixtures thereof and a refractive index that varies from 1.459 to 1.467.
Claim 17
Dependent Claim
20 words
The process of claim 14 wherein the concentration of said stabilizer varies from 0.1 percent to 0.3 percent by weight.
Claim 18
Dependent Claim
37 words
The process of claim 9 wherein the blend of diorganopolysiloxane polymers comprises polymers having a phenyl content as low as 5 percent by weight and polymers having a phenyl content as high as 50 percent by weight.
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |