US2597029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superheterodyne radio receiver employing a multifunction tube
Assignee: International Standard Electric Corp
•
Filing: 1946-09-21
•
Granted: 1952-05-20
•
Expires: 1966-09-21
Abstract
No abstract record available.
Inventors
- 👤 Edward D Phinney
- 👤 Reeves Alec Harley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:02
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/46; H03F3/48; H03D; H03D1/00; H03D1/14; H03D1/16; H03D7/00; H03D7/06; H03D7/08; H04; H04L; H04L27/00; H04L27/02; H04L27/06
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) | 1955-05-20 | 1955-11-19 | 1956-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-20 | 1959-11-19 | 1960-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-20 | 1963-11-19 | 1964-05-20 | $7700.00 | Window Closed / Lapsed |