US2453465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for mixing drilling mud
Assignee: JOHN H POE
•
Filing: 1945-11-16
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Granted: 1948-11-09
•
Expires: 1965-11-16
Abstract
No abstract record available.
Inventors
- 👤 John I Sloan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:30
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/06; E21B21/062; B; B01; B01F; B01F25/00; B01F25/20; B01F25/27; B01F35/00; B01F35/71; B01F35/712; B01F35/717; B01F35/718; B01F35/71805; B01F35/718051; B01F23/00; B01F23/50
Claims Analysis
Total Claims: 0
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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) | 1951-11-09 | 1952-05-10 | 1952-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-09 | 1956-05-10 | 1956-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-09 | 1960-05-10 | 1960-11-09 | $7700.00 | Window Closed / Lapsed |