Patent US2914686A successfully refreshed from Google Patents.
US2914686A
Expired / Lapsed
US
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Crystal microphone
Assignee: Texaco Inc
•
Filing: 1953-10-06
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Granted: 1959-11-24
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Expires: 1973-10-06
Abstract
No abstract record available.
Inventors
- 👤 Roy J Clements
- 👤 Robert J Loofbourrow
- 👤 Burton D Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:36
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0644; B06B1/0662; B06B1/0677; Y; Y10; Y10S; Y10S367/00; Y10S367/908
Claims Analysis
Total Claims: 0
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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) | 1962-11-23 | 1963-05-25 | 1963-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-23 | 1967-05-25 | 1967-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-23 | 1971-05-25 | 1971-11-24 | $7700.00 | Window Closed / Lapsed |