Patent US6313885B1 successfully refreshed from Google Patents.
US2580503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sectional frame structure
Assignee: Internat Derrick & Equipment C
•
Filing: 1945-07-23
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Granted: 1952-01-01
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Expires: 1965-07-23
Abstract
No abstract record available.
Inventors
- 👤 Clifford R Athy
- 👤 Charles R Konkle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:31
CPC Classifications
E; E04; E04H; E04H12/00; E04H12/02; E04H12/08; E04H12/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB190300761A
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US1506984A
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US1626393A
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US1582584A
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US1643888A
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US1837374A
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US2074548A
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US2200775A
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US2295861A
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US2331558A
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US2381647A
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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) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |