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US2587474A
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Assignee: Individual
•
Filing: 1949-05-03
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Granted: 1952-02-26
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Expires: 1969-05-03
Abstract
No abstract record available.
Inventors
- 👤 Ellis M Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:20
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/08; E21B33/03; E21B33/04; F; F16; F16J; F16J15/00; F16J15/16; F16J15/18; F16J15/184
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US950268A
Cited
US1387301A
Cited
US1487283A
Cited
US1592249A
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US2348160A
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US2368137A
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US2480229A
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US2477882A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-25 | 1955-08-27 | 1956-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-25 | 1959-08-27 | 1960-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-25 | 1963-08-27 | 1964-02-26 | $7700.00 | Window Closed / Lapsed |