Patent US3437148A successfully refreshed from Google Patents.
US3437148A
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Method and article for increasing the permeability of earth formations
Assignee: Union Carbide Corp
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Filing: 1967-01-06
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Granted: 1969-04-08
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Expires: 1987-01-06
Abstract
No abstract record available.
Inventors
- 👤 Patrick J Colpoys Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:08
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/80; E; E21; E21B; E21B43/00; E21B43/25; E21B43/26; E21B43/267; Y; Y10; Y10S; Y10S507/00; Y10S507/906; Y10S507/922; Y10S507/924
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2699212A
Cited
US2950247A
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US3217801A
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US3175616A
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US3285340A
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US3237693A
Cited
US3266573A
Cited
US3323594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-07 | 1972-10-07 | 1973-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-07 | 1976-10-07 | 1977-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-07 | 1980-10-07 | 1981-04-08 | $7700.00 | Window Closed / Lapsed |