Patent US3694909A successfully refreshed from Google Patents.
Patent US3314489A successfully refreshed from Google Patents.
US3314489A
Expired / Lapsed
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Low invasion coring fluid
Assignee: ExxonMobil Upstream Research Co
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Filing: 1964-10-30
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Granted: 1967-04-18
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Expires: 1984-10-30
Abstract
No abstract record available.
Inventors
- 👤 Raymond A Humphrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:28
CPC Classifications
E; E21; E21B; E21B25/00; E21B25/08; Y; Y10; Y10S; Y10S507/00; Y10S507/91
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
35 words
AN OIL-BASE CORING FLUID COMPRISING FROM 20 TO 45 WEIGHT PERCENT GILSONITE DISPERSED IN A MINERAL OIL HAVING AN ANILINE POINT OF AT LEAST 175*F., AND A VISCOSITY OF 10 TO 100 CENTIPOISES AT 100*F.
Claim 2
Dependent Claim
35 words
AN OIL-BASE CORING FLUID COMPRISING FROM 20 TO 45 WEIGHT PERCENT GILSONITE DISPERSED IN A MINERAL OIL HAVING AN ANILINE POINT OF AT LEAST 175*F., AND A VISCOSITY OF 10 TO 100 CENTIPOISES AT 100*F.
Claim 3
Dependent Claim
68 words
IN THE RECOVERY OF CORE SAMPLES FROM A BOREHOLE IN THE EARTH BY ROTARY CORE DRILLING, WHEREIN A NON-INVADING FLUID IS CIRCULATED DOWN THE HOLE, THE IMPROVEMENT WHICH COMPRISES CIRCULATING AS SAID FLUID A C OMPOSITION COMPRISING A DISPERSION OF 20 TO 45 WEIGHT PERCENT GILSONITE IN A PETROLEUM FRACTION HAVING AN ANILINE POINT OF AT LEAST 175*F. AND A VISCOSITY OF 10 TO 100 CENTIPOSES AT 100*F.
Claim 4
Dependent Claim
68 words
IN THE RECOVERY OF CORE SAMPLES FROM A BOREHOLE IN THE EARTH BY ROTARY CORE DRILLING, WHEREIN A NON-INVADING FLUID IS CIRCULATED DOWN THE HOLE, THE IMPROVEMENT WHICH COMPRISES CIRCULATING AS SAID FLUID A C OMPOSITION COMPRISING A DISPERSION OF 20 TO 45 WEIGHT PERCENT GILSONITE IN A PETROLEUM FRACTION HAVING AN ANILINE POINT OF AT LEAST 175*F. AND A VISCOSITY OF 10 TO 100 CENTIPOSES AT 100*F.
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) | 1970-04-17 | 1970-10-17 | 1971-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-17 | 1974-10-17 | 1975-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-17 | 1978-10-17 | 1979-04-18 | $7700.00 | Window Closed / Lapsed |