Patent US2720693A successfully refreshed from Google Patents.
US2720693A
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Method of making electromagnetic contactors
Assignee: Cutler Hammer Inc
•
Filing: 1951-03-09
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Granted: 1955-10-18
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Expires: 1971-03-09
Abstract
No abstract record available.
Inventors
- 👤 Allan P Charbonneau
- 👤 Frank J Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:38
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/12; H01H1/14; H01H1/20; H01H51/00; H01H51/02; H01H51/04; H01H51/06; H01H51/065; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |