US2721840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling mud treating composition
Assignee: Diamond Shamrock Corp
•
Filing: 1949-04-06
•
Granted: 1955-10-25
•
Expires: 1969-04-06
Abstract
No abstract record available.
Inventors
- 👤 Edison G Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:04
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/03; C09K8/035
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
A DRY, FREE-FLOWING, NON-CAKING ADDITIVE FOR DRILLING MUDS COMPRISING A MECHANICAL MIXTURE OF DRY GROUND QUEBRACHO EXTRACT AND BETWEEN 5% AND 25% BY WEIGHT THEREOF OF ALKALI METAL LIGNOSULFONATE.
Claim 2
Dependent Claim
29 words
A DRY, FREE-FLOWING, NON-CAKING ADDITIVE FOR DRILLING MUDS COMPRISING A MECHANICAL MIXTURE OF DRY GROUND QUEBRACHO EXTRACT AND BETWEEN 5% AND 25% BY WEIGHT THEREOF OF ALKALI METAL LIGNOSULFONATE.
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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) | 1958-10-24 | 1959-04-25 | 1959-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-24 | 1963-04-25 | 1963-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-24 | 1967-04-25 | 1967-10-25 | $7700.00 | Window Closed / Lapsed |