Patent US2756209A successfully refreshed from Google Patents.
US2756209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preventing lost circulation of mud in
Assignee: —
•
Filing: —
•
Granted: 1956-07-24
•
Expires: 1973-07-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:47
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A COMPOSITION OF MATTER FOR USE IN DRILLING BORE HOLES IN THE EARTH COMPRISING DRILLING MUD TO WHICH HAS BEEN ADDED A MINOR PROPORTION OF SLENDER FIBERS COMPRISING PIG HAIR, THE QUANTITY OF FIBERS BEING SUFFICIENT TO RETARD THE LOSS OF DRILLING MUD INTO CREVICES AND FISSURES ENCOUNTERED BY THE BORE HOLE.
Claim 2
Dependent Claim
52 words
A COMPOSITION OF MATTER FOR USE IN DRILLING BORE HOLES IN THE EARTH COMPRISING DRILLING MUD TO WHICH HAS BEEN ADDED A MINOR PROPORTION OF SLENDER FIBERS COMPRISING PIG HAIR, THE QUANTITY OF FIBERS BEING SUFFICIENT TO RETARD THE LOSS OF DRILLING MUD INTO CREVICES AND FISSURES ENCOUNTERED BY THE BORE HOLE.
References Cited (Backward Citations)
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Cited
US2119829A
Cited
US2214366A
Cited
US2398347A
Cited
US2599745A
Cited
US2610149A
Cited
US2634236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-24 | 1960-01-23 | 1960-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-24 | 1964-01-23 | 1964-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-24 | 1968-01-23 | 1968-07-24 | $7700.00 | Window Closed / Lapsed |