US2785753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single packer oil production method
Assignee: Individual
•
Filing: 1954-06-28
•
Granted: 1957-03-19
•
Expires: 1974-06-28
Abstract
No abstract record available.
Inventors
- 👤 Spearow Ralph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:52
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1252557A
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US1457479A
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US1816260A
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US2044657A
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US2377529A
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US2593497A
Cited
US2725106A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-18 | 1960-09-17 | 1961-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-18 | 1964-09-17 | 1965-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-18 | 1968-09-17 | 1969-03-19 | $7700.00 | Window Closed / Lapsed |