Patent US3405352A successfully refreshed from Google Patents.
US3405352A
Expired / Lapsed
US
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Square wave switching circuit having sharp turn-on and turn-off characteristics
Assignee: Allis Chalmers Corp
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Filing: 1965-10-21
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Granted: 1968-10-08
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Expires: 1985-10-21
Abstract
No abstract record available.
Inventors
- 👤 Richard J Wondra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:49
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/04; H01M8/04298; H01M8/04313; H01M8/04537; H01M8/04544; H01M8/04559; G; G01; G01R; G01R27/00; G01R27/02; H01H; H01H9/00; H01H9/54; H01H9/541; H01H9/542; H01M8/04574; H01M8/04589; H01M8/04694; H01M8/04955; H01M8/04992; H03; H03K; H03K3/00; H03K3/02; H03K3/35; H03K3/351; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
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) | 1971-10-08 | 1972-04-08 | 1972-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-08 | 1976-04-08 | 1976-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-08 | 1980-04-08 | 1980-10-08 | $7700.00 | Window Closed / Lapsed |