US2820159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic vibration exciter
Assignee: Textron Inc
•
Filing: 1954-09-09
•
Granted: 1958-01-14
•
Expires: 1974-09-09
Abstract
No abstract record available.
Inventors
- 👤 Gerald K Reen
- 👤 Donald S Mccluskey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:52
CPC Classifications
B; B28; B28B; B28B1/00; B28B1/08; B28B1/087; B28B1/0873; B06; B06B; B06B1/00; B06B1/02; B06B1/04; B06B1/045; H; H02; H02K; H02K33/00; H02K33/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US513421A
Cited
GB191013716A
Cited
US2084561A
Cited
US2632858A
Cited
US2645728A
Cited
US2717319A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |