US3221825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well drilling fluid and a method of using same
Assignee: Individual
•
Filing: 1962-03-15
•
Granted: 1965-12-07
•
Expires: 1982-03-15
Abstract
No abstract record available.
Inventors
- 👤 Homer I Henderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:59
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/003
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
49 words
IN THE PROCESS OF WELL DRILLING, INCLUDING THE USE OF A DRILLING FLUID CIRCULATING SYSTEM, THE IMPROVEMENT COMPRISING THE STEPS OF: PROVIDING A SUPPLY OF FLUID, ADDING A QUANTITY OF CORK PARTICLES TO SAID FLUID, AND INTRODUCING THE FLUID WITH CORK PARTICLE ADDITIVES INTO THE DRILLING FLUID CIRCULATING SYSTEM.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |