US3457528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broadband negative resistance device
Assignee: University of Illinois at Urbana-Champaign
•
Filing: 1965-12-14
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Granted: 1969-07-22
•
Expires: 1985-12-14
Abstract
No abstract record available.
Inventors
- 👤 Paul G Ingerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:39
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/46; H03H11/52; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/16; H04B3/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1987440A
Cited
US2522402A
Cited
US2522395A
Cited
US3040267A
Cited
US3187266A
Cited
US3255421A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |