US3444449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protection circuit for solid state switching network
Assignee: Leeds and Northrup Co
•
Filing: 1967-02-13
•
Granted: 1969-05-13
•
Expires: 1987-02-13
Abstract
No abstract record available.
Inventors
- 👤 Louis D Di Napoli
- 👤 William J Shaffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:45
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/32; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1919; G05D23/20; G05D23/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3253202A
Cited
US3309593A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |