Patent US4592959A successfully refreshed from Google Patents.
US4592959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicone encapsulated devices
Assignee: AT&T Inc
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Filing: 1984-11-19
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Granted: 1986-06-03
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Expires: 2004-11-19
Abstract
Abstract A method of extending the shelf-life of an uncured silicone resin formulation which includes a primary amine therein comprises adding an acid to the formulation in a molar quantity approximately equal to the number of moles of primary amine present in the formulation, said acid being volatile at or below the curing temperature of the resin formulation.
Inventors
- 👤 Ching-Ping Wong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:19
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/46; C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08L; C08L83/00; C08L83/04; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
89 words
An article of manufacture comprises an electronic device having gold or tantalum conductive areas on a surface thereof, a silicone resin encapsulant thereover which is adherent to said gold or tantalum surfaces and wherein said encapsulant is derived from curing a heat curable silicone resin formulation comprising a silicone, a primary amine additive and an acid which is volatile at the curing temperature, said acid being present in a molar quantity approximately equal to or slightly greater than the number of moles of primary amine present in the formulation.
Claim 2
Dependent Claim
89 words
An article of manufacture comprises an electronic device having gold or tantalum conductive areas on a surface thereof, a silicone resin encapsulant thereover which is adherent to said gold or tantalum surfaces and wherein said encapsulant is derived from curing a heat curable silicone resin formulation comprising a silicone, a primary amine additive and an acid which is volatile at the curing temperature, said acid being present in a molar quantity approximately equal to or slightly greater than the number of moles of primary amine present in the formulation.
Claim 3
Dependent Claim
15 words
The article of manufacture recited in claim 1, wherein the acid is an organic acid.
Claim 4
Dependent Claim
23 words
The article of manufacture recited in claim 2, wherein the acid is selected from the group consisting of formic, acetic and propionic acids.
Claim 5
Dependent Claim
14 words
The article of manufacture recited in claim 1, wherein the acid is acetic acid.
Claim 6
Dependent Claim
18 words
The article of manufacture recited in claim 1, wherein the primary amine in the formulation is a dialkylaminoalkoxysilane.
Claim 7
Dependent Claim
15 words
The article of manufacture recited in claim 1, wherein the primary amine is N-1-aminoethyl-3-aminopropyl-trimethoxy silane.
Claim 8
Dependent Claim
24 words
The article of manufacture recited in claim 5, wherein the acid is a member of the group consisting of formic, acetic and propionic acid.
Claim 9
Dependent Claim
24 words
The article of manufacture recited in claim 6, wherein the acid is a member of the group consisting of formic, acetic and propionic acid.
Claim 10
Dependent Claim
14 words
The article of manufacture recited in claim 6, wherein the acid is acetic acid.
Claim 11
Dependent Claim
14 words
The article of manufacture recited in claim 1, including adding filler to the formulation.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-02 | 1989-12-02 | 1990-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-02 | 1993-12-02 | 1994-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-02 | 1997-12-02 | 1998-06-03 | $7700.00 | Window Closed / Lapsed |