Patent US3428764A successfully refreshed from Google Patents.
US3428764A
Expired / Lapsed
US
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Interlocking mechanism for electrical controllers
Assignee: Cutler Hammer Inc
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Filing: 1967-04-03
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Granted: 1969-02-18
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Expires: 1987-04-03
Abstract
No abstract record available.
Inventors
- 👤 John F Drees
- 👤 Elmer M Kunath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:25
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/20; H01H9/26; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18856; Y10T74/18888; Y10T74/1892; Y10T74/18936; Y10T74/20; Y10T74/20207; Y10T74/20238
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) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |