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US2817440A
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Mud fluid classifier
Assignee: Individual
•
Filing: 1955-03-28
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Granted: 1957-12-24
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Expires: 1975-03-28
Abstract
No abstract record available.
Inventors
- 👤 Casner Ralph
- 👤 Arnold S Melton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:12
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/06; E21B21/063; E21B21/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US95089A
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US291190A
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US397585A
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US496670A
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US745870A
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US1333287A
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US1829544A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-23 | 1961-06-24 | 1961-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-23 | 1965-06-24 | 1965-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-23 | 1969-06-24 | 1969-12-24 | $7700.00 | Window Closed / Lapsed |