Patent US2223308A successfully refreshed from Google Patents.
US2223308A
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Assignee: ROVELL Manufacturing CORP
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Filing: 1939-07-20
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Granted: 1940-11-26
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Expires: 1959-07-20
Abstract
No abstract record available.
Inventors
- 👤 Rovell Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:30
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/0001; G02B6/0011; G02B6/0081; G02B6/0086; G02B6/0091; G09; G09F; G09F1/00; G09F1/10; G09F1/14; G02B6/0066; G02B6/007; G02B6/0071; G09F13/00; G09F13/18; G09F2013/1872; G09F2013/1877
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-11-26 | 1944-05-27 | 1944-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-11-26 | 1948-05-27 | 1948-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-11-26 | 1952-05-27 | 1952-11-26 | $7700.00 | Window Closed / Lapsed |