US3421142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit to indicate presence of charging current
Assignee: Westinghouse Electric Corp
•
Filing: 1966-06-13
•
Granted: 1969-01-07
•
Expires: 1986-06-13
Abstract
No abstract record available.
Inventors
- 👤 Paul J Kircher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:32
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/145; G01R19/15; Y; Y10; Y10S; Y10S320/00; Y10S320/18; Y10S320/19
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2385620A
Cited
US2449150A
Cited
US3281636A
Cited
US3257599A
Cited
US3217224A
Cited
US3370214A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |