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US2840643A
Expired / Lapsed
US
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Integral transformer electromagnetic transducer
Assignee: Raytheon Co
•
Filing: 1955-04-04
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Granted: 1958-06-24
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Expires: 1975-04-04
Abstract
No abstract record available.
Inventors
- 👤 David F Brower
- 👤 Griest Raymond Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:48
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/17; G11B5/10; G11B5/187
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2677019A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |