US3404318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative resistance diode
Assignee: Sprague Electric Co
•
Filing: 1964-05-08
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Granted: 1968-10-01
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Expires: 1984-05-08
Abstract
No abstract record available.
Inventors
- 👤 Lindmayer Joseph
- 👤 Charles Y Wrigley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:53
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/313; H03D; H03D3/00; H03D3/26; H03D7/00; H03D7/02; H03D7/04; H10; H10D; H10D99/00; Y; Y10; Y10S; Y10S257/00; Y10S257/914
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-01 | 1972-04-01 | 1972-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-01 | 1976-04-01 | 1976-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-01 | 1980-04-01 | 1980-10-01 | $7700.00 | Window Closed / Lapsed |