Patent US3195635A successfully refreshed from Google Patents.
US3195635A
Expired / Lapsed
US
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Spacers for fracture props
Assignee: Pan American Petroleum Corp
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Filing: 1963-05-23
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Granted: 1965-07-20
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Expires: 1983-05-23
Abstract
No abstract record available.
Inventors
- 👤 Clarence R Fast
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:18
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/25; E21B43/26; E21B43/267; Y; Y10; Y10S; Y10S507/00; Y10S507/922; Y10S507/924
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
IN A PROCESS FOR FRACTURING FORMATION PENETRATED BY A WELL, IN WHICH PROCESS A FRACTURING LIQUID IS INJECTED INTO THE FORMATION UNDER A PRESSURE SUFFICIENT TO FRACTURE THE FORMATION AND DEPOSIT IN THE FRACTURE A MIXTURE OF PERMANENT PROPS AND SPACER PARTICLES SOLUBLE IN WELL FLUIDS, THE IMPROVEMENT COMPRISING EMPLOYING AS SAID SPACER PARTICLES PRILLED UREA OF SUBSTANTIALLY THE SAME PARTICLE SIZE AS SAID PERMANENT PROPS.
Claim 2
Dependent Claim
66 words
IN A PROCESS FOR FRACTURING FORMATION PENETRATED BY A WELL, IN WHICH PROCESS A FRACTURING LIQUID IS INJECTED INTO THE FORMATION UNDER A PRESSURE SUFFICIENT TO FRACTURE THE FORMATION AND DEPOSIT IN THE FRACTURE A MIXTURE OF PERMANENT PROPS AND SPACER PARTICLES SOLUBLE IN WELL FLUIDS, THE IMPROVEMENT COMPRISING EMPLOYING AS SAID SPACER PARTICLES PRILLED UREA OF SUBSTANTIALLY THE SAME PARTICLE SIZE AS SAID PERMANENT PROPS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-19 | 1969-01-18 | 1969-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-19 | 1973-01-18 | 1973-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-19 | 1977-01-18 | 1977-07-20 | $7700.00 | Window Closed / Lapsed |