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Patent US3397744A successfully refreshed from Google Patents.
US3397744A
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Method and composition for fracturing permeable earth formations
Assignee: GAF Corp
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Filing: 1965-10-28
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Granted: 1968-08-20
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Expires: 1985-10-28
Abstract
No abstract record available.
Inventors
- 👤 Eugene V Hort
- 👤 Carl A Bergman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:06
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/66; C09K8/68; C09K8/685
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2508341A
Cited
US2658045A
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US2810716A
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US2927913A
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US3302717A
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US3252904A
Cited
US3235490A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |