US3532908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tunable bandpass active filter
Assignee: RTX Corp
•
Filing: 1969-10-15
•
Granted: 1970-10-06
•
Expires: 1989-10-15
Abstract
No abstract record available.
Inventors
- 👤 James E Jennings
- 👤 Lester H Kosowsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:16
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/04; H03H11/12; H03H11/1213
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2732528A
Cited
US2106793A
Cited
US2816228A
Cited
US3070762A
Cited
US3257631A
Cited
US3206619A
Cited
US3290624A
Cited
US3296546A
Cited
US3289102A
Cited
US3356865A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-05 | 1974-04-06 | 1974-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-05 | 1978-04-06 | 1978-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-05 | 1982-04-06 | 1982-10-06 | $7700.00 | Window Closed / Lapsed |