Patent US2584930A successfully refreshed from Google Patents.
US2584930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil base drilling fluid
Assignee: Shell Development Co
•
Filing: 1949-11-28
•
Granted: 1952-02-05
•
Expires: 1969-11-28
Abstract
No abstract record available.
Inventors
- 👤 Shinouda Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:51
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
AN OIL-CONTAINING DRILLING FLUID FOR WELLS, COMPRISING A SUBSTANTIAL QUANTITY OF AN AROMATIC MINERAL OIL, A FINELY DIVIDED WEIGHTING MATERIAL DISPERSED IN SAID FLUID, AND FROM 1 TO 20% BY WEIGHT OF THE OIL OF A MICRO-CRYSTALLINE PARAFFIN WAX SUSPENDED IN SAID OIL.
Claim 2
Dependent Claim
43 words
AN OIL-CONTAINING DRILLING FLUID FOR WELLS, COMPRISING A SUBSTANTIAL QUANTITY OF AN AROMATIC MINERAL OIL, A FINELY DIVIDED WEIGHTING MATERIAL DISPERSED IN SAID FLUID, AND FROM 1 TO 20% BY WEIGHT OF THE OIL OF A MICRO-CRYSTALLINE PARAFFIN WAX SUSPENDED IN SAID OIL.
References Cited (Backward Citations)
US1053720A
Cited
US1455010A
Cited
US2126096A
Cited
US2214263A
Cited
US2509588A
Cited
US2497398A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-04 | 1955-08-06 | 1956-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-04 | 1959-08-06 | 1960-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-04 | 1963-08-06 | 1964-02-05 | $7700.00 | Window Closed / Lapsed |