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US2621024A
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Assignee: LEO T KOPPL
•
Filing: 1946-09-13
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Granted: 1952-12-09
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Expires: 1966-09-13
Abstract
No abstract record available.
Inventors
- 👤 Koppl Ernest
- 👤 Leo T Koppl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:02
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/107; E21B31/113; E21B31/1135
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1530803A
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US1849879A
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US1977110A
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US2126241A
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US2055683A
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US2122751A
Cited
US2172480A
Cited
US2166299A
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US2309872A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-09 | 1956-06-09 | 1956-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-09 | 1960-06-09 | 1960-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-09 | 1964-06-09 | 1964-12-09 | $7700.00 | Window Closed / Lapsed |