US3296126A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling mud
Assignee: Kalle GmbH and Co KG
•
Filing: 1964-12-03
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Granted: 1967-01-03
•
Expires: 1984-12-03
Abstract
No abstract record available.
Inventors
- 👤 Diener Horst
- 👤 Ulmschneider Dieter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:57
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A DRILLING MUD COMPRISING WATER, A CLAY IN A CONCENTRATION OF 2 TO 10 PERCENT BY WEIGHT, AND, AS A PROTECTIVE COLLOID, A POLY-N-VINYL CARBOXYLIC ACID AMIDE HAVING A K-VALUE OF 20 TO 140 AND BEING PRESENT IN AN AMOUNT SUFFICIENT TO REDUCE WATER LOSS,THE CARBOXYLIC ACID PRECURSOR OF THE AMIDE HAVING 2 TO 7 CARBON ATOMS.
Claim 2
Dependent Claim
57 words
A DRILLING MUD COMPRISING WATER, A CLAY IN A CONCENTRATION OF 2 TO 10 PERCENT BY WEIGHT, AND, AS A PROTECTIVE COLLOID, A POLY-N-VINYL CARBOXYLIC ACID AMIDE HAVING A K-VALUE OF 20 TO 140 AND BEING PRESENT IN AN AMOUNT SUFFICIENT TO REDUCE WATER LOSS,THE CARBOXYLIC ACID PRECURSOR OF THE AMIDE HAVING 2 TO 7 CARBON ATOMS.
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) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |