US2811488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lost circulation
Assignee: Texaco Inc
•
Filing: 1954-06-28
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Granted: 1957-10-29
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Expires: 1974-06-28
Abstract
No abstract record available.
Inventors
- 👤 Alfred C Nestle
- 👤 Victor J Tronolone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:00
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A COMPOSITION OF MATTER SUITABLE FOR USE IN A DRILLING FLUID FOR CORRECTING LOST CIRCULATION COMPRISING AN ADMIXTURE OF FIBROUS, GROUND LEATHER AND OTTAWA SAND HAVING A SIZE RANGE IN THE RANGE 20-30 MESH, SAID FIBROUS LEATHER AND SAID SAND BEING PRESENT IN THE ADMIXTURE IN THE WEIGHT RATIO RANGE 1:7-9, RESPECTIVELY.
Claim 2
Dependent Claim
52 words
A COMPOSITION OF MATTER SUITABLE FOR USE IN A DRILLING FLUID FOR CORRECTING LOST CIRCULATION COMPRISING AN ADMIXTURE OF FIBROUS, GROUND LEATHER AND OTTAWA SAND HAVING A SIZE RANGE IN THE RANGE 20-30 MESH, SAID FIBROUS LEATHER AND SAID SAND BEING PRESENT IN THE ADMIXTURE IN THE WEIGHT RATIO RANGE 1:7-9, RESPECTIVELY.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |