Patent US4707513A successfully refreshed from Google Patents.
Patent US2749308A successfully refreshed from Google Patents.
US2749308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Material for treating oil well drilling fluids
Assignee: Weyerhaeuser Timber Co
•
Filing: 1952-06-21
•
Granted: 1956-06-05
•
Expires: 1972-06-21
Abstract
No abstract record available.
Inventors
- 👤 William G Van Beckum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:07
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A PRODUCT FOR TREATING OIL WELL DRILLING FLUIDS COMPRISING A MIXTURE OF WOOD FIBER AND THE COMMINUTED CORK COMPONENT OF THE BARK OF TREES, SAID CORK BEING OF PLUS 65-MESH SIZE, THE PRODUCT BEING CAPABLE OF FORMING A BARRIER FOR PREVENTING LOSS OF WELL DRILLING FLUID TO CRACKS, CREVICES, FISSURES AND THE LIKE ENCOUNTERED BY THE DRILL, THE PRODUCT BEING COMPRESSED TO A DENSITY OF FROM 10 POUNDS TO ABOUT 30 POUNDS PER CUBIC FOOT, THE CORK COMPONENT BEING PRESENT IN AN AMOUNT SUFFICIENT TO SUBSTANTIALLY REDUCE FELTING OF THE COMPRESSED FIBER AND TO ENHANCE THE DISPERSION OF THE FIBER IN THE MUD.
Claim 2
Dependent Claim
103 words
A PRODUCT FOR TREATING OIL WELL DRILLING FLUIDS COMPRISING A MIXTURE OF WOOD FIBER AND THE COMMINUTED CORK COMPONENT OF THE BARK OF TREES, SAID CORK BEING OF PLUS 65-MESH SIZE, THE PRODUCT BEING CAPABLE OF FORMING A BARRIER FOR PREVENTING LOSS OF WELL DRILLING FLUID TO CRACKS, CREVICES, FISSURES AND THE LIKE ENCOUNTERED BY THE DRILL, THE PRODUCT BEING COMPRESSED TO A DENSITY OF FROM 10 POUNDS TO ABOUT 30 POUNDS PER CUBIC FOOT, THE CORK COMPONENT BEING PRESENT IN AN AMOUNT SUFFICIENT TO SUBSTANTIALLY REDUCE FELTING OF THE COMPRESSED FIBER AND TO ENHANCE THE DISPERSION OF THE FIBER IN THE MUD.
References Cited (Backward Citations)
US2064936A
Cited
US2119829A
Cited
US2214366A
Cited
US2601050A
Cited
US2599745A
Cited
US2610149A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |