US2783644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making tests in vessels and conduits containing fluids
Assignee: Willis Oil Tool Co
•
Filing: 1952-07-28
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Granted: 1957-03-05
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Expires: 1972-07-28
Abstract
No abstract record available.
Inventors
- 👤 Robert S Willis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:01
CPC Classifications
G; G01; G01N; G01N17/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1833700A
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US1769463A
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US1966712A
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US2250244A
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US2398958A
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GB654851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-04 | 1960-09-03 | 1961-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-04 | 1964-09-03 | 1965-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-04 | 1968-09-03 | 1969-03-05 | $7700.00 | Window Closed / Lapsed |