Patent US2952449A successfully refreshed from Google Patents.
US2952449A
Expired / Lapsed
US
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Method of forming underground communication between boreholes
Assignee: FMC Corp
•
Filing: 1957-02-01
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Granted: 1960-09-13
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Expires: 1977-02-01
Abstract
No abstract record available.
Inventors
- 👤 Carl A Bays
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:09
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/17; E21B43/28; E21B43/283
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1960932A
Cited
US2584605A
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US2642142A
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GB716620A
Cited
US2780450A
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US2780449A
Cited
US2758653A
Cited
US2847202A
Cited
US2850270A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |