US3373815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fracturing of subterranean formations
Assignee: ExxonMobil Upstream Research Co
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Filing: 1966-05-06
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Granted: 1968-03-19
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Expires: 1986-05-06
Abstract
No abstract record available.
Inventors
- 👤 Othar M Kiel
- 👤 Albert L Kidwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:58
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/25; E21B43/26; E21B43/267
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
IN A METHOD FOR PROPPING OPEN A FRACTURE IN A SUBTERRANEAN FORMATION SURROUNDING A WELLBORE, THE IMPROVEMENT WHICH COMPRISES INJECTING INTO SAID FRACTURE A FLUID SUSPENSION OF NATURALLY-OCCURRING INDIVIDUAL CRYSTALS OF A MINERAL WHICH IS ESSENTIALLY INERT TO THE FORMATION FLUIDS AND HAS A MOHS'' HARDNESS VALUE OF ABOUT 6 OR GREATER, SAID CRYSTALS BEING BETWEEN ABOUT 2 1/2 AND ABOUT 40 MESH ON THE U.S. STANDARD SIEVE SERIES SCALE IN SIZE.
Claim 2
Dependent Claim
72 words
IN A METHOD FOR PROPPING OPEN A FRACTURE IN A SUBTERRANEAN FORMATION SURROUNDING A WELLBORE, THE IMPROVEMENT WHICH COMPRISES INJECTING INTO SAID FRACTURE A FLUID SUSPENSION OF NATURALLY-OCCURRING INDIVIDUAL CRYSTALS OF A MINERAL WHICH IS ESSENTIALLY INERT TO THE FORMATION FLUIDS AND HAS A MOHS'' HARDNESS VALUE OF ABOUT 6 OR GREATER, SAID CRYSTALS BEING BETWEEN ABOUT 2 1/2 AND ABOUT 40 MESH ON THE U.S. STANDARD SIEVE SERIES SCALE IN SIZE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-19 | 1971-09-18 | 1972-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-19 | 1975-09-18 | 1976-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-19 | 1979-09-18 | 1980-03-19 | $7700.00 | Window Closed / Lapsed |