US3446928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interrupting device having u-shaped parallel current paths
Assignee: Allis Chalmers Corp
•
Filing: 1965-10-20
•
Granted: 1969-05-27
•
Expires: 1985-10-20
Abstract
No abstract record available.
Inventors
- 👤 William E Harper
- 👤 Joseph M Ramrath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:46
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/02; H01H33/04; H01H33/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US592497A
Cited
DE489082C
Cited
US977577A
Cited
CH72321A
Cited
US2792476A
Cited
US2977446A
Cited
US3017480A
Cited
US3259725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-26 | 1972-11-25 | 1973-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-26 | 1976-11-25 | 1977-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-26 | 1980-11-25 | 1981-05-27 | $7700.00 | Window Closed / Lapsed |