US2504469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve modulator
Assignee: Telephone Manufacturing Co Ltd
•
Filing: 1946-11-13
•
Granted: 1950-04-18
•
Expires: 1966-11-13
Abstract
No abstract record available.
Inventors
- 👤 Tillman John Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:35
CPC Classifications
H; H03; H03C; H03C1/00; H03C1/16; H03C1/18; H03C1/22; H03B; H03B21/00; H03B21/01; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/30; H04B1/302
Claims Analysis
Total Claims: 0
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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) | 1953-04-17 | 1953-10-17 | 1954-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-17 | 1957-10-17 | 1958-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-17 | 1961-10-17 | 1962-04-18 | $7700.00 | Window Closed / Lapsed |