US3590467A
Expired / Lapsed
US
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Method for bonding a crystal to a solid delay medium
Assignee: SIGNAL TECHNOLOGY Corp A CORP OF
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Filing: 1968-11-15
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Granted: 1971-07-06
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Expires: 1988-11-15
Abstract
Abstract A method by which metallic base layers are first deposited on the mating surfaces of a crystal and delay medium which layers are suitable for bonding with indium. Thereafter, a layer of indium is deposited on at least one of the mating surfaces in a substantially nonoxidizing environment. The mating surfaces are then pressed together at a pressure of at least 90 p.s.i. while the indium is heated to a molten state and maintained in such a condition for at least 15 seconds. Thereafter, the temperature of the indium is reduced below its melting point to solidify the indium and form the bond.
Inventors
- 👤 John R Chase
- 👤 John A Rimer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:57
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/04; C04B37/003; C04B37/006; H; H03; H03H; H03H3/00; H03H3/007; C04B2235/00; C04B2235/60; C04B2235/604; C04B2235/65; C04B2235/656; C04B2235/6567; C04B2237/00; C04B2237/02; C04B2237/12; C04B2237/121; C04B2237/123; C04B2237/125; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/341; C04B2237/50; C04B2237/52; C04B2237/70; C04B2237/708; C04B2237/72; Y; Y10; Y10T; Y10T29/00; Y10T29/42; Y10T29/47
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
34 words
The method according to claim 1 wherein said base layers consist essentially of a nickel-chromium alloy and gold deposited on said crystal in the order named, and a nickel-chromium alloy deposited on said medium.
Claim 2
Dependent Claim
37 words
The method according to claim 1 wherein said base layers consist essentially of aluminum, nickel and gold deposited on said crystal in the order named, and aluminum and nickel deposited on said medium in the order named.
Claim 3
Dependent Claim
26 words
The method according to claim 1 wherein said base layers consist essentially of a platinum-gold alloy deposited on said crystal and platinum deposited on said medium.
Claim 4
Dependent Claim
19 words
The method according to claim 1 wherein said layer of indium is deposited by the process of vacuum evaporation.
Claim 5
Dependent Claim
14 words
The method according to claim 1 wherein said temperature is at least 156* C.
Claim 6
Dependent Claim
32 words
The method according to claim 1 wherein the step of pressing said surfaces together is carried out in air, said pressure being maintained so long as said indium is at said temperature.
Claim 7
Dependent Claim
27 words
The method according to claim 7 further comprising the step of burnishing the surface of said layer of indium prior to the step of pressing said surfaces.
Claim 8
Dependent Claim
27 words
The method of claim 1 wherein said crystal is quartz, said temperature to which said layer of indium is heated being between 156* C. and 590* C.
Claim 9
Dependent Claim
32 words
The method of claim 1 wherein said crystal is a ceramic consisting essentially of lead-zirconate-titanate, said temperature to which said layer of indium is heated being between 156* C. and 300* C.
Claim 10
Dependent Claim
32 words
The method of claim 1 wherein said crystal is a ceramic consisting essentially of lead-zirconium-niobate, said temperature to which said layer of indium is heated being between 156* C. and 160* C.
Claim 11
Independent Claim
163 words
A method for forming a bond between a crystal selected from the group consisting of quartz and ceramic, and a solid delay medium selected from the group consisting of fused silica, glass and ceramic, the steps of which comprise: depositing a first base layer of nickel-chromium alloy on a mating surface of said crystal, depositing a layer of gold on said first base layer, depositing a second base layer of nickel-chromium alloy on a mating surface of said delay medium, depositing a layer of indium on said second base layer in a substantially nonoxidizing environment, pressing said surfaces together at a pressure of at least 90 p.s.i., heating said layer of indium to a temperature of at least 156* C. while said surfaces are under said pressure, maintaining said temperature for between 15 seconds and 30 minutes, reducing said temperature below 156* C. while said surfaces are under said pressure, whereby said indium solidifies to form said bond, and thereafter removing said pressure.
References Cited (Backward Citations)
US2754238A
Cited
US2709147A
Cited
GB800519A
Cited
US3042550A
Cited
US3131459A
Cited
US3131460A
Cited
US3252722A
Cited
GB930352A
Cited
US3246384A
Cited
US3235943A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |