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US2558944A
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Assignee: Individual
•
Filing: 1945-09-19
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Granted: 1951-07-03
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Expires: 1965-09-19
Abstract
No abstract record available.
Inventors
- 👤 Emmerson Thomas Herbert Ridley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:01
CPC Classifications
E; E01; E01F; E01F9/00; E01F9/60; E01F9/688
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US334912A
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US346197A
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US1374471A
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US1412632A
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US1425945A
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US1488236A
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US1530210A
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US1637988A
Cited
US1805095A
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US2002248A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-02 | 1955-01-01 | 1955-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-02 | 1959-01-01 | 1959-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-02 | 1963-01-01 | 1963-07-03 | $7700.00 | Window Closed / Lapsed |