Patent US3577629A successfully refreshed from Google Patents.
US3577629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bonding oxidizable metals to insulators
Assignee: Duracell Inc USA
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Filing: 1968-10-18
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Granted: 1971-05-04
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Expires: 1988-10-18
Abstract
Abstract An insulating member, such as a glass or fiber-optic, is bonded to a metallic member without excessive oxidation thereof by first heating the insulating member to a relatively low temperature and impressing a voltage across the members, causing an attraction between them which largely excludes atmospheric oxygen from the region to be bonded. The lowered resistivity of the insulator at this temperature also causes a low-density electric current to flow from one member to the other. The insulating member is then heated to a higher temperature while a voltage is maintained across the members, at which temperature a permanent bond is formed between the members in a relatively short time.
Inventors
- 👤 George Wallis
- 👤 John J Dorsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:48
CPC Classifications
C; C03; C03C; C03C27/00; C03C27/02; C03C27/04; Y; Y10; Y10S; Y10S228/00; Y10S228/903
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
15 words
A method according to claim 1, wherein said metallic member is an iron-based metal alloy.
Claim 2
Dependent Claim
12 words
A method according to claim 2, wherein said metallic member contains nickel.
Claim 3
Dependent Claim
13 words
A method according to claim 3, wherein said insulating member is a glass.
Claim 4
Dependent Claim
23 words
A method according to claim 4, wherein said glass is selected from the group consisting of fiber-optic glasses, borosilicate glasses and quartz glasses.
Claim 5
Dependent Claim
13 words
A method according to claim 5, wherein said glass is a fiber-optic glass.
Claim 6
Independent Claim
113 words
A method of bonding a readily oxidizable metallic member to an insulating member having increased electrical conductivity at elevated temperatures; said method comprising the steps of: placing complementary surfaces of said members in contact with each other; inhibiting oxide growth upon the contacting surface of said metallic member by heating said insulating member to a temperature sufficient to render said insulating member electrically conductive and subjecting said members to an electrical potential sufficient to establish an electrostatic attraction therebetween; and effecting a bond between said contacting surfacEs by heating said insulating member to an increased temperature below its fusion point while maintaining said potential below the dielectric breakdown point of said insulating member.
Claim 7
Dependent Claim
15 words
A method according to claim 7, wherein said metallic member is an iron-based metal alloy.
Claim 8
Dependent Claim
12 words
A method according to claim 8, wherein said metallic member contains nickel.
Claim 9
Dependent Claim
13 words
A method according to claim 9, wherein said insulating member is a glass.
Claim 10
Dependent Claim
23 words
A method according to claim 10, wherein said glass is selected from the group consisting of fiber-optic glasses, borosilicate glasses and quartz glasses.
Claim 11
Dependent Claim
13 words
A method according to claim 11, wherein said glass is a fiber-optic glass.
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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |