US2802122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic damper
Assignee: Individual
•
Filing: 1954-12-03
•
Granted: 1957-08-06
•
Expires: 1974-12-03
Abstract
No abstract record available.
Inventors
- 👤 Hugh E Riordan
- 👤 Edward J Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:41
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/02; H02K49/04; H02K49/043
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US469800A
Cited
US590648A
Cited
US1098753A
Cited
US1298465A
Cited
GB446159A
Cited
US2622707A
Cited
US2653257A
Cited
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 |