US4609212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil or gas field casing
Assignee: Vodafone GmbH
•
Filing: 1982-04-09
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Granted: 1986-09-02
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Expires: 2002-04-09
Abstract
Abstract The made thread end of an oil or gas field casing is tapered at a range of from 1:8 to 1:6.5 and a thread pitch of 3.2 to 2 threads per inch, these dimensions being applied to a pipe larger than 400 mm diameter and a wall thickness of up to 32 mm.
Inventors
- 👤 Armin Hosang
- 👤 Josef Versch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:22
CPC Classifications
F; F16; F16L; F16L15/00; F16L15/001; E; E21; E21B; E21B17/00; E21B17/02; E21B17/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
68 words
Large diameter casing for the oil and gas field industry with one or more free ending threads, the pipe having a tapered thread end; an outer diameter exceeding 400 millimeters; and a wall thickness of up to about 32 millimeters; the improvement comprising a thread pitch of 3.5 to two threads per inch and a cone taper in the range of 1 to 7.75 to 1 to 7.25.
Claim 2
Dependent Claim
68 words
Large diameter casing for the oil and gas field industry with one or more free ending threads, the pipe having a tapered thread end; an outer diameter exceeding 400 millimeters; and a wall thickness of up to about 32 millimeters; the improvement comprising a thread pitch of 3.5 to two threads per inch and a cone taper in the range of 1 to 7.75 to 1 to 7.25.
Claim 3
Dependent Claim
12 words
Casing as in claims 1, the thread having an buttress cross section.
Claim 4
Dependent Claim
12 words
Casing as in claim 1, the thread having a trapezoidal cross section.
Claim 5
Dependent Claim
11 words
Casing as in claim 1, the pipe ending smoothly without thickening.
References Cited (Backward Citations)
US2885225A
Cited
US3355192A
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US3388752A
Cited
US3586353A
Cited
US4004832A
Cited
US4384737A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-01 | 1990-03-03 | 1990-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-01 | 1994-03-03 | 1994-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-01 | 1998-03-03 | 1998-09-02 | $7700.00 | Window Closed / Lapsed |