Patent US3048226A successfully refreshed from Google Patents.
US3048226A
Expired / Lapsed
US
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Use of pulsating pressures for increasing the permeability of underground structures
Assignee: Individual
•
Filing: 1955-04-04
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Granted: 1962-08-07
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Expires: 1975-04-04
Abstract
No abstract record available.
Inventors
- 👤 Edward W Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:12
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/003; E21B28/00; E21B43/25; E21B43/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE23381E
Cited
US941409A
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US2304793A
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US2350212A
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US2700422A
Cited
US2680485A
Cited
USRE23733E
Cited
US2554005A
Cited
US2866509A
Cited
US2871943A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-06 | 1966-02-05 | 1966-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-06 | 1970-02-05 | 1970-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-06 | 1974-02-05 | 1974-08-07 | $7700.00 | Window Closed / Lapsed |