US2155035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric crystal apparatus
Assignee: AT&T Inc
•
Filing: 1936-01-02
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Granted: 1939-04-18
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Expires: 1956-01-02
Abstract
No abstract record available.
Inventors
- 👤 Carl A Bieling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:41
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/54; H03H9/58; H03H9/02; H03H9/05; H03H9/0504; H03H9/09; H03H9/15; H03H9/21; H03H9/215; H03H9/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-04-17 | 1942-10-17 | 1943-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-04-17 | 1946-10-17 | 1947-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-04-17 | 1950-10-17 | 1951-04-18 | $7700.00 | Window Closed / Lapsed |