US3593125A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystal testing apparatus for use with an oscilloscope
Assignee: HARRY T SHOVER
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Filing: 1969-07-16
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Granted: 1971-07-13
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Expires: 1989-07-16
Abstract
Abstract Apparatus for quickly determining the characteristics of a crystal. An oscillator, the frequency range of which is varied by either varying or inserting different impedances in the tank circuit, energizes the crystal being tested. The sawtooth sweep signal of an oscilloscope is used to vary the capacitance of a diode which in turn causes the oscillator to sweep through the frequency range broadly set by the tank circuit impedance.
Inventors
- 👤 Peter G Wilhelm
- 👤 Harry T Shover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:40
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/22
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
124 words
A circuit suitable for testing a crystal by using an oscilloscope which includes a sawtooth generator and display means, comprising: a variable attenuator; a first variable inductance connected in parallel with said crystal between said variable attenuator and said oscilloscope display means; variable frequency oscillator means including first, second and third means for controlling the frequency of said oscillator, said first frequency control means including a second variable inductance, said second frequency control means including a variable capacitance and said third frequency control means including a variable voltage control diode which is connected through a switch to be controlled by said oscilloscope sawtooth generator; and circuit means connecting said oscillator means and said variable attenuator and including a frequency meter and a resistive network.
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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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |