US3412353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shielded high voltage electrical apparatus permitting potential test
Assignee: Allis Chalmers Corp
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Filing: 1966-05-09
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Granted: 1968-11-19
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Expires: 1986-05-09
Abstract
No abstract record available.
Inventors
- 👤 Richmond P Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:23
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/02; H01F27/04
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) | 1971-11-19 | 1972-05-20 | 1972-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-19 | 1976-05-20 | 1976-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-19 | 1980-05-20 | 1980-11-19 | $7700.00 | Window Closed / Lapsed |