US2989799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of quartz crystal frequency controlling elements
Assignee: AT&T Inc
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Filing: 1958-10-15
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Granted: 1961-06-27
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Expires: 1978-10-15
Abstract
No abstract record available.
Inventors
- 👤 Warren P Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:35
CPC Classifications
H; H03; H03H; H03H3/00; H03H3/007; H03H3/02; H03H3/04; Y; Y10; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A METHOD OF PRODUCING AN IMPROVED QUARTZ CRYSTAL FREQUENCY CONTROLLING ELEMENT COMPRISING INTRODUCING IMPURITY ATOMS TO A CONCENTRATION OF APPROXIMATELY 1,000 PARTS PER MILLION INTO THE LATTICE STRUCTURE OF THE ELEMENT, BOMBARDING THE ELEMENT WITH NEUTRONS AT AN INTEGRATED CONCENTRATION BETWEEN 10**17 AND FIVE TIMES 10**17 NEUTRONS PER SQUARE CENTIMETER, HEATING THE ELEMENT TO A TEMPERATURE BETWEEN 400 AND 450 DEGREES CENTIGRADE,
Claim 2
Independent Claim
62 words
A METHOD OF PRODUCING AN IMPROVED QUARTZ CRYSTAL FREQUENCY CONTROLLING ELEMENT COMPRISING INTRODUCING IMPURITY ATOMS TO A CONCENTRATION OF APPROXIMATELY 1,000 PARTS PER MILLION INTO THE LATTICE STRUCTURE OF THE ELEMENT, BOMBARDING THE ELEMENT WITH NEUTRONS AT AN INTEGRATED CONCENTRATION BETWEEN 10**17 AND FIVE TIMES 10**17 NEUTRONS PER SQUARE CENTIMETER, HEATING THE ELEMENT TO A TEMPERATURE BETWEEN 400 AND 450 DEGREES CENTIGRADE,
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) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |