US3506572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling mud composition and process
Assignee: MI Drilling Fluids Co
•
Filing: 1966-05-25
•
Granted: 1970-04-14
•
Expires: 1986-05-25
Abstract
No abstract record available.
Inventors
- 👤 Orien W Van Dyke
- 👤 Keith L Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:47
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/05; Y; Y10; Y10S; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE16631E
Cited
US2557643A
Cited
US2485231A
Cited
US2605221A
Cited
GB822841A
Cited
US3307625A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-13 | 1973-10-13 | 1974-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-13 | 1977-10-13 | 1978-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-13 | 1981-10-13 | 1982-04-14 | $7700.00 | Window Closed / Lapsed |