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US2660680A
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Crystal temperature control means
Assignee: AT&T Inc
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Filing: 1950-08-09
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Granted: 1953-11-24
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Expires: 1970-08-09
Abstract
No abstract record available.
Inventors
- 👤 Lawrence F Koerner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:04
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/05; H03H9/08; H03H9/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1930763A
Cited
GB570043A
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US2393429A
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US2388242A
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US2479987A
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US2505370A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-23 | 1957-05-25 | 1957-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-23 | 1961-05-25 | 1961-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-23 | 1965-05-25 | 1965-11-24 | $7700.00 | Window Closed / Lapsed |