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Patent US2442548A successfully refreshed from Google Patents.
US2442548A
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Well pressure control equipment
Assignee: Vetco Gray LLC
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Filing: 1944-04-08
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Granted: 1948-06-01
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Expires: 1964-04-08
Abstract
No abstract record available.
Inventors
- 👤 Robert A Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:43
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1502106A
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US1981279A
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US2043428A
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US2092261A
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US2150887A
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US2148327A
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US2241288A
Cited
US2329981A
Cited
US2292873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-01 | 1951-12-01 | 1952-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-01 | 1955-12-01 | 1956-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-01 | 1959-12-01 | 1960-06-01 | $7700.00 | Window Closed / Lapsed |