US4263702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a quartz resonator
Assignee: United States Department of the Army
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Filing: 1979-05-18
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Granted: 1981-04-28
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Expires: 1999-05-18
Abstract
Abstract A quartz resonator is made from a chemically polished quartz plate. The plate is placed in an enclosure fitted with at least three mounting clips to receive the plate. The plate is secured to the clips with an electrically conductive adhesive capable of withstanding operation at 350 degrees C. The assembly is cleaned and a metallic electrode deposited onto the plate until the desired frequency is reached. The enclosure is then hermetically sealed. The resulting resonator can consistently withstand extremely high shocks.
Inventors
- 👤 John R. Vig
- 👤 Raymond L. Filler
- 👤 R. Donald Peters
- 👤 James M. Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:55
CPC Classifications
H; H03; H03H; H03H3/00; H03H3/007; H03H3/02; Y; Y10; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
77 words
Method of making a quartz resonator wherein the resonator can withstand extremely high shocks, said method including the steps of: (a) preparing a chemically polished quartz plate, (b) placing the plate in an enclosure fitted with mounting clips to receive said plate, (c) securing the plate to the clips with an electrically conductive bonding agent, (d) depositing metallic electrodes onto both faces of the plate until the desired frequency is reached, and (e) hermetically sealing the enclsoure.
Claim 2
Dependent Claim
77 words
Method of making a quartz resonator wherein the resonator can withstand extremely high shocks, said method including the steps of: (a) preparing a chemically polished quartz plate, (b) placing the plate in an enclosure fitted with mounting clips to receive said plate, (c) securing the plate to the clips with an electrically conductive bonding agent, (d) depositing metallic electrodes onto both faces of the plate until the desired frequency is reached, and (e) hermetically sealing the enclsoure.
Claim 3
Dependent Claim
23 words
Method according to claim 1 wherein between steps (a) and (b) a metallic contact is applied near the edge of the quartz plate.
Claim 4
Dependent Claim
59 words
Method according to claim 2 wherein the metallic contact is selected from the group consisting of a thin film of molybdenum and a thin film of gold over the molybdenum, a thin film of chromium and a thin film of gold over the chromium, and a thin film of titanium and a thin film of palladium over the titanium.
Claim 5
Dependent Claim
24 words
Method according to claim 3 wherein the metallic contact is a thin film of molybdenum and a thin film of gold over the molybdenum.
Claim 6
Dependent Claim
24 words
Method according to claim 3 wherein the metallic contact is a thin film of chromium and a thin film of gold over the chromium.
Claim 7
Dependent Claim
24 words
Method according to claim 3 wherein the metallic contact is a thin film of titanium and a thin film of palladium over the titanium.
Claim 8
Dependent Claim
16 words
Method according to claim 1 wherein said enclosure is fitted with at least three mounting clips.
Claim 9
Dependent Claim
14 words
Method according to claim 7 wherein said enclosure is fitted with four mounting clips.
Claim 10
Dependent Claim
31 words
Method according to claim 8 wherein the said mounting clips are placed at about 28 degrees, 152 degrees, 208 degrees, and 332 degrees from the ZZ' axis of the quartz plate.
Claim 11
Dependent Claim
31 words
Method according to claim 8 wherein the said mounting clips are placed at about 45 degrees, 135 degrees, 225 degrees, and 315 degrees from the ZZ' direction of the quartz plate.
Claim 12
Dependent Claim
27 words
Method according to claim 1 wherein said mounting clips are made of a metal that does not deform permanently when subject to stresses experienced during high shock.
Claim 13
Dependent Claim
20 words
Method according to claim 11 wherein said metal is selected from the group consisting of molybdenum, Inconel, and stainless steel.
Claim 14
Dependent Claim
10 words
Method according to claim 12 wherein said metal is molybdenum.
Claim 15
Dependent Claim
10 words
Method according to claim 12 wherein said metal is Inconel.
Claim 16
Dependent Claim
11 words
Method according to claim 12 wherein said metal is stainless steel.
Claim 17
Dependent Claim
35 words
Method according to claim 1 wherein said electrically conductive bonding agent is an electrically conductive adhesive selected from the group consisting of silver filled polyimide, gold filled polyimide, silver filled epoxy, and gold filled epoxy.
Claim 18
Dependent Claim
14 words
Method according to claim 16 wherein said electrically conductive adhesive is silver filled polyimide.
Claim 19
Dependent Claim
14 words
Method according to claim 16 wherein said electrically conductive adhesive is gold filled polyimide.
Claim 20
Dependent Claim
14 words
Method according to claim 16 wherein said electrically conductive adhesive is silver filled epoxy.
Claim 21
Dependent Claim
14 words
Method according to claim 16 wherein said electrically conductive adhesive is gold filled epoxy.
Claim 22
Dependent Claim
49 words
Method according to claim 17 wherein in step C, the assembly is cured in a flowing inert gas atmosphere according to the schedule: about 20 minutes at about 150 degrees C. about 20 minutes at about 300 degrees C. and at least 120 minutes at about 350 degrees C.
Claim 23
Dependent Claim
49 words
Method according to claim 18 wherein in step C, the assembly is cured in a flowing inert gas atmosphere according to the schedule: about 20 minutes at about 150 degrees C. about 20 minutes at about 300 degrees C. and at least 120 minutes at about 350 degrees C.
Claim 24
Dependent Claim
22 words
Method according to claim 1 wherein the metallic electrodes of step (d) are deposited at a temperature greater than 180 degrees C.
Claim 25
Dependent Claim
12 words
Method according to claim 1 wherein said enclosure is a ceramic flatpack.
Claim 26
Dependent Claim
12 words
Method according to claim 1 wherein said enclosure is a metal enclosure.
Claim 27
Dependent Claim
173 words
Method of making a quartz resonator from a chemically polished quartz plate wherein the resonator can withstand extremely high shocks, said method consisting of: (A) vapor depositing a molybdenum-gold contact onto the edge of the plate, (B) placing the plate in an enclosure fitted with four molybdenum mounting clips to receive the plate, (C) securing the plate to the clips with a silver filled polyimide adhesive so that there is a polyimide interface between the clip and the plate and curing the assembly in a flowing inert gas atmosphere according to the schedule: about 20 minutes at about 150 degrees C. about 20 minutes at about 300 degrees C. and at least 120 minutes at about 350 degrees C. (D) cleaning the assembly by exposing it to short wavelength ultraviolet light that generates ozone until a water contact angle of less than 6 degrees is achieved on the quartz surfaces, (E) vacuum evaporating a thin film of gold on both faces of the plate, and (F) hermetically sealing the enclosure in ultrahigh vacuum.
Claim 28
Dependent Claim
173 words
Method of making a quartz resonator from a chemically polished quartz plate wherein the resonator can withstand extremely high shocks, said method consisting of: (A) vapor depositing a molybdenum-gold contact onto the edge of the plate, (B) placing the plate in an enclosure fitted with four molybdenum mounting clips to receive the plate, (C) securing the plate to the clips with a silver filled polyimide adhesive so that there is a polyimide interface between the clip and the plate and curing the assembly in a flowing inert gas atmosphere according to the schedule: about 20 minutes at about 150 degrees C. about 20 minutes at about 300 degrees C. and at least 120 minutes at about 350 degrees C. (D) cleaning the assembly by exposing it to short wavelength ultraviolet light that generates ozone until a water contact angle of less than 6 degrees is achieved on the quartz surfaces, (E) vacuum evaporating a thin film of gold on both faces of the plate, and (F) hermetically sealing the enclosure in ultrahigh vacuum.
References Cited (Backward Citations)
US3931388A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-27 | 1984-10-27 | 1985-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-27 | 1988-10-27 | 1989-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-27 | 1992-10-27 | 1993-04-28 | $7700.00 | Window Closed / Lapsed |