US2423801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for mixing drilling mud
Assignee: JOHN H POE
•
Filing: 1944-12-05
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Granted: 1947-07-08
•
Expires: 1964-12-05
Abstract
No abstract record available.
Inventors
- 👤 John I Sloan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:14
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/06; E21B21/062; B; B01; B01F; B01F25/00; B01F25/30; B01F25/31; B01F25/312; B01F25/3124; B01F25/31242; B01F35/00; B01F35/71; B01F35/717; B01F35/7173; B01F35/71731; B01F35/7176; B01F35/718; B01F35/71805; B01F35/718051; B01F23/00; B01F23/50; B01F23/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US875345A
Cited
US1486883A
Cited
US2001506A
Cited
US2005800A
Cited
US2193219A
Cited
US2365858A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-07 | 1951-01-06 | 1951-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-07 | 1955-01-06 | 1955-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-07 | 1959-01-06 | 1959-07-08 | $7700.00 | Window Closed / Lapsed |