US3426295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative resistance microwave device
Assignee: AT&T Inc
•
Filing: 1966-05-16
•
Granted: 1969-02-04
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Expires: 1986-05-16
Abstract
No abstract record available.
Inventors
- 👤 Bernard C De Loach Jr
- 👤 Hermann K Gummel
- 👤 Donald L Scharfetter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:52
CPC Classifications
H; H10; H10D; H10D99/00; H03; H03B; H03B9/00; H03B9/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3192398A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-04 | 1972-08-05 | 1973-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-04 | 1976-08-05 | 1977-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-04 | 1980-08-05 | 1981-02-04 | $7700.00 | Window Closed / Lapsed |