US2855464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic head
Assignee: IIT Research Institute
•
Filing: 1952-06-20
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Granted: 1958-10-07
•
Expires: 1972-06-20
Abstract
No abstract record available.
Inventors
- 👤 David E Wiegand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:42
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/335; G01; G01R; G01R13/00; G01R13/04; G01R33/00; G01R33/02; G01R33/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2424295A
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US2423339A
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US2536260A
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US2649568A
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US2608621A
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US2768243A
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US2700703A
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US2722569A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |