US2802170A
Expired / Lapsed
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Electro-magnetic switches
Assignee: International Standard Electric Corp
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Filing: 1952-07-31
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Granted: 1957-08-06
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Expires: 1972-07-31
Abstract
No abstract record available.
Inventors
- 👤 Starr Arthur Tisso
- 👤 Grayson Harry
- 👤 Dunkley Rowland Arthur George
- 👤 Walker Thomas Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:57
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H01; H01F; H01F21/00; H01F21/02; H01F21/08; H01F29/00; H01F29/14; H01F29/143; H03; H03C; H03C3/00; H03C3/02; H03C3/09; H03K; H03K17/00; H03K17/51; H03K17/80; H03K3/00; H03K3/02; H03K3/45
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) | 1960-08-05 | 1961-02-04 | 1961-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-05 | 1965-02-04 | 1965-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-05 | 1969-02-04 | 1969-08-06 | $7700.00 | Window Closed / Lapsed |