Patent US2731234A successfully refreshed from Google Patents.
US2731234A
Expired / Lapsed
US
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Fluid handling apparatus for use with well drilling equipment
Assignee: Chiksan Co
•
Filing: 1952-04-14
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Granted: 1956-01-17
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Expires: 1972-04-14
Abstract
No abstract record available.
Inventors
- 👤 Peter J Bily
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:17
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US991501A
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US1963368A
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US1852632A
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US1938829A
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US2168837A
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US2537683A
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US2512006A
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US2509119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |