US2605222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid for drilling wells
Assignee: Shell Development Co
•
Filing: 1949-10-24
•
Granted: 1952-07-29
•
Expires: 1969-10-24
Abstract
No abstract record available.
Inventors
- 👤 Jones Gordon Kenneth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:46
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/32; Y; Y10; Y10S; Y10S507/00; Y10S507/904; Y10S507/91
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
113 words
A DRILLING FLUID COMPRISING MINERAL OIL, A FINELY DIVIDED WEIGHTING MATERIAL AND A NONOXIDIZED AND NON-SULFURIZED POLYMERIZED ASPHALTIC BITUMEN CAPABLE OF AIDING IN FORMING A FILTER CAKE ON THE WALL OF A WELL, SAID BITUMEN BEING POLYMERIZED BY HEATING FOR 1/2 TO 8 HOURS AT A TEMPERATURE FROM 150* C. TO 350* C. IN THE PRESENCE OF FROM 0.25 TO 10% BY WEIGHT OF A POLYMERIZATION PROMOTING PHENOL WITH AN ACTIVATED OH GROUP AS A POLYMERIZATION REACTANT, SAID POLYMERIZED ASPHALTIC BITUMEN BEING PRESENT IN AN AMOUNT SUFFICIENT TO REDUCE THE FLUID LOSS THROUGH SAID FILTER CAKE WITHOUT INCREASING THE VISCOSITY OF SAID DRILLING FLUID TO SUCH AN EXTENT THAT IT CANNOT BE CIRCULATED.
References Cited (Backward Citations)
US2179208A
Cited
US2465960A
Cited
US2380156A
Cited
US2360992A
Cited
US2316968A
Cited
US2370007A
Cited
US2350154A
Cited
US2430039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-29 | 1956-01-28 | 1956-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-29 | 1960-01-28 | 1960-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-29 | 1964-01-28 | 1964-07-29 | $7700.00 | Window Closed / Lapsed |