Patent US3615809A successfully refreshed from Google Patents.
US4058744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally stabilized crystal mounting assembly
Assignee: Motorola Solutions Inc
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Filing: 1976-06-07
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Granted: 1977-11-15
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Expires: 1996-06-07
Abstract
Abstract A unitary molded socket provides mounting for non-temperature compensated crystals, a resistor heating element for each crystal, and a thermistor. Each heating element is positioned adjacent a crystal housing for preventing the housing temperature from going below a given temperature. The thermistor is thermally coupled to one of the resistors for sensing its temperature and electrically coupled to control circuitry for providing the appropriate heating current to the resistor heating elements. A spring clip biases each crystal against its resistor, clamps it into the socket and is pivotable for replacement of components.
Inventors
- 👤 Arnold Vincent Dano
- 👤 Jerry James Tomaszewski
- 👤 Jerome Peter Friedrichs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:47
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/05; H03H9/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
194 words
A crystal stabilizing assembly for electronic apparatus comprising: a frequency controlling crystal coupled to a portion of the circuitry of the electronic apparatus for controlling the frequency of said portion; a hermetically sealed crystal housing for retaining the crystal; a heating element in contact with the outer surface of the crystal housing and thermally coupled to said housing; temperature sensing means in contact with said heating element for sensing the temperature of said heating element, and for providing an output in response to said temperature; control circuitry in said apparatus having an input coupled to the sensing means for receiving said sensing means output and having an output coupled to the heating element for providing a current thereto in response to the received input; unitary support member for supporting the crystal housing, the heating element and the temperature sensing means; and spring clip means mounted on the support member and having a first position for biasing the heating element against the crystal housing and for retaining the housing on the support member, and having a second position wherein the clip means is pivotable to allow release of the crystal housing from the support member.
Claim 2
Dependent Claim
194 words
A crystal stabilizing assembly for electronic apparatus comprising: a frequency controlling crystal coupled to a portion of the circuitry of the electronic apparatus for controlling the frequency of said portion; a hermetically sealed crystal housing for retaining the crystal; a heating element in contact with the outer surface of the crystal housing and thermally coupled to said housing; temperature sensing means in contact with said heating element for sensing the temperature of said heating element, and for providing an output in response to said temperature; control circuitry in said apparatus having an input coupled to the sensing means for receiving said sensing means output and having an output coupled to the heating element for providing a current thereto in response to the received input; unitary support member for supporting the crystal housing, the heating element and the temperature sensing means; and spring clip means mounted on the support member and having a first position for biasing the heating element against the crystal housing and for retaining the housing on the support member, and having a second position wherein the clip means is pivotable to allow release of the crystal housing from the support member.
Claim 3
Dependent Claim
16 words
The crystal stabilizing assembly in accordance with claim 1 wherein the heating element is a resistor.
Claim 4
Dependent Claim
17 words
A crystal stabilizing assembly in accordance with claim 1 wherein the heating element is a carbon resistor.
Claim 5
Dependent Claim
17 words
A crystal stabilizing assembly in accordance with claim 1 wherein the temperature sensing means is a thermistor.
Claim 6
Dependent Claim
20 words
A crystal stabilizing assembly in accordance with claim 1 wherein the unitary support member is a rigid molded plastic socket.
Claim 7
Dependent Claim
23 words
The crystal stabilizing assembly in accordance with claim 1 wherein the unitary support member comprises means for receiving the terminals of the crystal.
Claim 8
Dependent Claim
29 words
A crystal stabilizing assembly in accordance with claim 1 wherein the unitary support member has pedestal means for supporting the heating element near one side of the crystal housing.
Claim 9
Dependent Claim
35 words
The crystal stabilizing assembly in accordance with claim 1 and further comprising additional pairs of crystals and heating elements, each heating element coupled to the output of the control circuitry for receiving said heating current.
Claim 10
Dependent Claim
58 words
The crystal stabilizing assembly according to claim 1 wherein the spring clip, having a first stable position for biasing the heating element against the crystal housing, is pivotally mounted in the socket for rotation when in other than said first stable position whereby access may be had to the crystal, the heating element and the temperature sensing means.
Claim 11
Dependent Claim
20 words
The crystal stabilizing assembly in accordance with claim 1 wherein the spring clip means is a stainless steel wire spring.
Claim 12
Dependent Claim
129 words
A crystal stabilizing assembly for electronic apparatus comprising: a frequency controlling crystal; a hermetically sealed crystal housing for retaining the crystal; a heating element in contact with the outer surface of the crystal housing for conduction heating of said housing; temperature sensing means in contact with the heating element for sensing the temperature of said heating element; a unitary support member for supporting the crystal housing, the heating element and the temperature sensing means; and spring clip means mounted on the support member and having a first position for biasing the heating element against the crystal housing and for retaining the crystal housing on the support member and having a second position wherein the clip means is pivotable to allow release of the crystal housing from the support member.
Claim 13
Dependent Claim
129 words
A crystal stabilizing assembly for electronic apparatus comprising: a frequency controlling crystal; a hermetically sealed crystal housing for retaining the crystal; a heating element in contact with the outer surface of the crystal housing for conduction heating of said housing; temperature sensing means in contact with the heating element for sensing the temperature of said heating element; a unitary support member for supporting the crystal housing, the heating element and the temperature sensing means; and spring clip means mounted on the support member and having a first position for biasing the heating element against the crystal housing and for retaining the crystal housing on the support member and having a second position wherein the clip means is pivotable to allow release of the crystal housing from the support member.
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) | 1980-11-14 | 1981-05-16 | 1981-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-14 | 1985-05-16 | 1985-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-14 | 1989-05-16 | 1989-11-15 | $7700.00 | Window Closed / Lapsed |