Patent US1986894A successfully refreshed from Google Patents.
US1986894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonregenerative system and method of operating the same
Assignee: RADIO RES LAB Inc
•
Filing: 1931-07-22
•
Granted: 1935-01-08
•
Expires: 1951-07-22
Abstract
No abstract record available.
Inventors
- 👤 Laurent Herbert St
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:08
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1938-01-07 | 1938-07-09 | 1939-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-01-07 | 1942-07-09 | 1943-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-01-07 | 1946-07-09 | 1947-01-08 | $7700.00 | Window Closed / Lapsed |