Patent US3783218A successfully refreshed from Google Patents.
US3783218A
Expired / Lapsed
US
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Electrostatic bonding process
Assignee: General Electric Co
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Filing: 1972-01-12
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Granted: 1974-01-01
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Expires: 1992-01-12
Abstract
Abstract A process is disclosed for uniting a plurality of one or more vitreous members with one or more metallic members. The metallic members can be bodies of semiconductor material of either the monatomic or compound type. Such bodies are united in accordance with the invention by the process involving the application of heat and the simultaneous application of a magnetic field having flux lines extending in the plane of the surfaces to be united, and an electrostatic field.
Inventors
- 👤 N Adams
- 👤 E Baum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:02
CPC Classifications
C; C03; C03C; C03C27/00; C03C27/02; H; H10; H10W; H10W72/00; H10W72/30; H10W72/071; H10W72/073; H10W72/07331; H10W72/07337
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
111 words
The process of uniting a vitreous member and a metallic member comprising a. placing selected surfaces of said respective members in contact, b. heating said contacting surfaces to a temperature of about 300* to 450* Centigrade, c. applying to said members a magnetic field having flux lines extending generally in the plane of said contacting surfaces and having a flux density of about 3,000 to 20,000 gauss, and d. during the application of said magnetic field independently applying to said members a direct current electrostatic potenTial of about 250 to 350 volts, said magnetic field assisting in the vicinity of the electrostatic field to bond the contacting surfaces of the members.
Claim 2
Dependent Claim
111 words
The process of uniting a vitreous member and a metallic member comprising a. placing selected surfaces of said respective members in contact, b. heating said contacting surfaces to a temperature of about 300* to 450* Centigrade, c. applying to said members a magnetic field having flux lines extending generally in the plane of said contacting surfaces and having a flux density of about 3,000 to 20,000 gauss, and d. during the application of said magnetic field independently applying to said members a direct current electrostatic potenTial of about 250 to 350 volts, said magnetic field assisting in the vicinity of the electrostatic field to bond the contacting surfaces of the members.
Claim 3
Dependent Claim
31 words
The process defined in claim 1 wherein said vitreous member is a glass plate having a thickness measured in a direction normal to its selected surface of less than 0.050 inch.
Claim 4
Dependent Claim
22 words
The process defined in claim 1 wherein said electrostatic potential is applied to said members for no more than a few seconds.
Claim 5
Dependent Claim
39 words
The process defined in claim 1 wherein the positive polarity terminal of said electrostatic field is connected to said metallic member, and the negative polarity terminal of said field is connected to said vitreous member by a needle-like probe.
Claim 6
Dependent Claim
64 words
The process defined in claim 1 wherein the heating is accomplished by a resistance-heating element through which about 9 to 100 amperes r.m.s. of 60 hz alternating current or direct current is passed, said metallic member is situated in direct contact with said heating element during said heating, and said vitreous member is situated in direct contact with said metallic member during said heating.
Claim 7
Dependent Claim
112 words
The process of uniting two vitreous members and an interposed metallic member comprising a. placing selected surfaces of said respective members in contact, b. heating said contacting surfaces to a temperature of about 300* to 450* Centigrade, c. applying to said members a magnetic field having flux lines extending generally in the plane of said contacting surfaces and having a flux density of about 3,000 to 20,000 gauss, and d. during the application of said magnetic field independently applying to said members a direct current electrostatic potential of about 250 to 350 volts, said magnetic field assisting in the vicinity of the electrostatic field to bond the contacting surfaces of the members.
Claim 8
Dependent Claim
112 words
The process of uniting two vitreous members and an interposed metallic member comprising a. placing selected surfaces of said respective members in contact, b. heating said contacting surfaces to a temperature of about 300* to 450* Centigrade, c. applying to said members a magnetic field having flux lines extending generally in the plane of said contacting surfaces and having a flux density of about 3,000 to 20,000 gauss, and d. during the application of said magnetic field independently applying to said members a direct current electrostatic potential of about 250 to 350 volts, said magnetic field assisting in the vicinity of the electrostatic field to bond the contacting surfaces of the members.
Claim 9
Dependent Claim
112 words
The process of uniting two metallic members and an interposed vitreous member comprising a. placing selected surfaces of said respective members in contact, b. heating said contacting surfaces to a temperature of about 300* to 450* Centigrade, c. applying to said members a magnetic field having flux lines extending generally in the plane of said contacting surfaces and having a flux density of about 3000 to 20000 gauss, and d. during the application of said magnetic field independently applying to said members a direct current electrostatic potential of about 250 to 350 volts, said magnetic field assisting in the vicinity of the electrostatic field to bond the contacting surfaces of the members.
Claim 10
Dependent Claim
112 words
The process of uniting two metallic members and an interposed vitreous member comprising a. placing selected surfaces of said respective members in contact, b. heating said contacting surfaces to a temperature of about 300* to 450* Centigrade, c. applying to said members a magnetic field having flux lines extending generally in the plane of said contacting surfaces and having a flux density of about 3000 to 20000 gauss, and d. during the application of said magnetic field independently applying to said members a direct current electrostatic potential of about 250 to 350 volts, said magnetic field assisting in the vicinity of the electrostatic field to bond the contacting surfaces of the members.
Claim 11
Dependent Claim
115 words
The process of uniting contacting surfaces of a stack of interposed vitreous and metallic members comprising a. placing selected surfaces of said respective members in contact, b. heating said contacting surfaces to a temperature of about 300* to 450* Centigrade, c. applying to said members a magnetic field having flux lines extending generally in the plane of said contacting surfaces and having a flux density of about 3,000 to 20,000 gauss, and d. during the application of said magnetic field independently applying to said members a direct current electrostatic potential of about 250 to 350 volts, said magnetic field assisting in the vicinity of the electrostatic field to bond the contacting surfaces of the members.
Claim 12
Dependent Claim
115 words
The process of uniting contacting surfaces of a stack of interposed vitreous and metallic members comprising a. placing selected surfaces of said respective members in contact, b. heating said contacting surfaces to a temperature of about 300* to 450* Centigrade, c. applying to said members a magnetic field having flux lines extending generally in the plane of said contacting surfaces and having a flux density of about 3,000 to 20,000 gauss, and d. during the application of said magnetic field independently applying to said members a direct current electrostatic potential of about 250 to 350 volts, said magnetic field assisting in the vicinity of the electrostatic field to bond the contacting surfaces of the members.
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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |