Patent US2009438A successfully refreshed from Google Patents.
US2636975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency heating apparatus
Assignee: —
•
Filing: —
•
Granted: 1953-04-28
•
Expires: 1970-04-28
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:38
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/78; H05B6/70
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2311658A
Cited
US2373233A
Cited
US2357313A
Cited
US2404279A
Cited
US2404566A
Cited
US2419557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-27 | 1956-10-27 | 1957-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-27 | 1960-10-27 | 1961-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-27 | 1964-10-27 | 1965-04-28 | $7700.00 | Window Closed / Lapsed |