Patent US2920223A successfully refreshed from Google Patents.
US2920223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pxras
Assignee: —
•
Filing: —
•
Granted: 1960-01-05
•
Expires: 1977-01-05
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:08
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/52; H01T13/20; H01T13/32; H01T13/39; H01T13/46; H01T13/467; H01T13/50; H01T21/00; H01T21/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1537903A
Cited
US950847A
Cited
GB191022517A
Cited
US2176858A
Cited
US2391455A
Cited
US2689556A
Cited
US2760099A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |