Patent US2809439A successfully refreshed from Google Patents.
US2809439A
Expired / Lapsed
US
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Assignee: Individual
•
Filing: 1954-06-17
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Granted: 1957-10-15
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Expires: 1974-06-17
Abstract
No abstract record available.
Inventors
- 👤 Homer E Ringgold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:02
CPC Classifications
B; B23; B23Q; B23Q3/00; B23Q3/18; B25; B25D; B25D5/00; B25D5/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US468857A
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GB191018447A
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US1160752A
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US1233458A
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US1295785A
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US1420847A
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US1688819A
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US2086435A
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US2365461A
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US2465227A
Cited
US2526528A
Cited
US2595347A
Cited
US2675625A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |