US1968237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Band pass circuit
Assignee: RCA Corp
•
Filing: 1931-10-01
•
Granted: 1934-07-31
•
Expires: 1951-10-01
Abstract
No abstract record available.
Inventors
- 👤 Weyers Theodorus Josephus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:20
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/0115; H03H7/17; H03H7/1741; H03H7/175; H03H7/1775
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) | 1937-07-30 | 1938-01-29 | 1938-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-07-30 | 1942-01-29 | 1942-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-07-30 | 1946-01-29 | 1946-07-31 | $7700.00 | Window Closed / Lapsed |