US3754153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystal mounting assembly
Assignee: FREQUENCY CONTROL PRODUCTS Inc A CORP OF NY
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Filing: 1971-12-02
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Granted: 1973-08-21
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Expires: 1991-12-02
Abstract
Abstract A crystal mounting assembly provided with a hermetically sealed and evacuated envelope in which a crystal unit is supported on a rigid ceramic substrate by means of strain-free leads connecting the crystal electrodes to contacts plated on the substrate. The substrate contacts are connected to terminal pins projecting from the envelope, whereby the lead-supported crystal is mechanically isolated from and unaffected by stresses imposed on the pins.
Inventors
- 👤 J Carpenter
- 👤 C Spreckels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:29
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/05; H03H9/10; H03H9/1007; H03H9/1014; G; G04; G04F; G04F5/00; G04F5/04; G04F5/06; G04F5/063; H03H9/09
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
173 words
A miniaturized crystal mounting assembly comprising: A. an evacuated metal envelope having a base section and a cover section joined thereto, said sections being relatively shallow; B. first and second terminal pins passing through and projecting from the base section, said pins being insulated from the envelope; C. a rigid insulating plate formed of a ceramic material having a substantially zero temperature coefficient of expansion seated within said base section on the floor thereof, said plate having at least two contacts plated on the top surface thereof, the inner ends of said pins passing through bores in said plate and being connected to said contacts; D. a bar-shaped piezoelectric crystal unit having electrodes thereon; and E. strain-free leads for supporting said unit within said cover section above said plate, the longitudinal axis of said unit being parallel to the surface of said plate, said leads being connected between said electrodes at nodal points thereon adjacent the ends of said bar-shaped unit and said contacts on said plate adjacent the ends of said plate.
Claim 2
Dependent Claim
173 words
A miniaturized crystal mounting assembly comprising: A. an evacuated metal envelope having a base section and a cover section joined thereto, said sections being relatively shallow; B. first and second terminal pins passing through and projecting from the base section, said pins being insulated from the envelope; C. a rigid insulating plate formed of a ceramic material having a substantially zero temperature coefficient of expansion seated within said base section on the floor thereof, said plate having at least two contacts plated on the top surface thereof, the inner ends of said pins passing through bores in said plate and being connected to said contacts; D. a bar-shaped piezoelectric crystal unit having electrodes thereon; and E. strain-free leads for supporting said unit within said cover section above said plate, the longitudinal axis of said unit being parallel to the surface of said plate, said leads being connected between said electrodes at nodal points thereon adjacent the ends of said bar-shaped unit and said contacts on said plate adjacent the ends of said plate.
Claim 3
Dependent Claim
25 words
An assembly as set forth in claim 1, wherein said face and cover sections have complementary peripheral flanges formed therein which are cold welded together.
Claim 4
Dependent Claim
25 words
An assembly as set forth in claim 1, wherein said pins are anchored on the floor of said base section by glass- to metal seals.
Claim 5
Dependent Claim
19 words
An assembly as set forth in claim 1, wherein said crystal is provided with an X-Y cut crystal element.
Claim 6
Dependent Claim
48 words
An assembly as set forth in claim 4, wherein the faces of said element have electrodes plated thereon, the top and bottom face electrodes being interconnected by a strip plated along one side face of said element, the left and right face electrodes being disconnected on the element.
Claim 7
Dependent Claim
107 words
An assembly as set forth in claim 5, wherein said plate has a conductive layer coated thereon on one side thereof which constitutes a first contact which is connected to said first pin, second and third conductive layers coated thereon on the other side thereof constituting second and third contacts, said second pin being connected to said second contact, four symmetrically arranged leads being provided, the first and second leads extending between the left and right electrodes and said first contact, the third lead extending between said connecting strip and said second contact, and the fourth lead being connected between said left electrode and said third contact.
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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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |