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US2858894A
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Assignee: Individual
•
Filing: 1954-06-14
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Granted: 1958-11-04
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Expires: 1974-06-14
Abstract
No abstract record available.
Inventors
- 👤 Swan M Akeyson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:04
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B43/08; E21B43/088; E21B43/084
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US152652A
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US615847A
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US2007862A
Cited
US2090545A
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AU2317635A
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US2217370A
Cited
US2388640A
Cited
US2725144A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-03 | 1962-05-05 | 1962-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-03 | 1966-05-05 | 1966-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-03 | 1970-05-05 | 1970-11-04 | $7700.00 | Window Closed / Lapsed |