Patent US2587231A successfully refreshed from Google Patents.
US2587231A
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US
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Assignee: Individual
•
Filing: 1949-08-01
•
Granted: 1952-02-26
•
Expires: 1969-08-01
Abstract
No abstract record available.
Inventors
- 👤 Schierding William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:01
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1563837A
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US1867720A
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US2040889A
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US2128914A
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US2073877A
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US2126684A
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US2403002A
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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 |