US2540540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mud mixer
Assignee: Individual
•
Filing: 1949-01-11
•
Granted: 1951-02-06
•
Expires: 1969-01-11
Abstract
No abstract record available.
Inventors
- 👤 Clifford W Murphy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:06
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/06; E21B21/062; B; B01; B01F; B01F27/00; B01F27/80; B01F27/93
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US920597A
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US1010257A
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US1057487A
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US1131260A
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US1172603A
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US1371865A
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US1673827A
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US1731953A
Cited
US2072506A
Cited
US2361123A
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US2352122A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |