US3873139A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe joint
Assignee: Chicago Bridge and Iron Co
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Filing: 1973-10-29
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Granted: 1975-03-25
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Expires: 1993-10-29
Abstract
Abstract A pipe joint with crack propagation resistance comprising a first pipe end, a second pipe end in axial alignment with, and close to, the first pipe end, a tubular sleeve containing and encircling the first pipe end and the second pipe end, said tubular sleeve having at least two elongated sections which are welded together at abutting edges and the ends of the sleeve sections are welded to the adjacent pipes, and a hole in each elongated weld joint wider than the weld and extending between the two pipe ends, and optionally means sealing the hole without welding in the hole.
Inventors
- 👤 John Stanton Mccabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:46
CPC Classifications
F; F16; F16L; F16L13/00; F16L13/02; F16L13/0218; F16L13/0236
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
135 words
A pipe joint comprising: a first metal pipe end portion; a second metal pipe end portion in axial alignment with, and close to, the first pipe end portion; a metal tubular sleeve containing and encircling the first pipe end portion and the second pipe end portion; said tubular sleeve comprising at least two elongated sections which are welded together at abutting edges to form elongated weld joints and the ends of the sleeve sections are welded to the adjacent pipes; and each elongated weld joint in the sleeve having a hole therein wider than the weld, said hole extending through said weld and portions of said tubular sleeve and spanning the space between the two pipe ends whereby said hole renders the elongated weld joint discontinuous and prevents the formation of a crack generating zone.
Claim 2
Dependent Claim
135 words
A pipe joint comprising: a first metal pipe end portion; a second metal pipe end portion in axial alignment with, and close to, the first pipe end portion; a metal tubular sleeve containing and encircling the first pipe end portion and the second pipe end portion; said tubular sleeve comprising at least two elongated sections which are welded together at abutting edges to form elongated weld joints and the ends of the sleeve sections are welded to the adjacent pipes; and each elongated weld joint in the sleeve having a hole therein wider than the weld, said hole extending through said weld and portions of said tubular sleeve and spanning the space between the two pipe ends whereby said hole renders the elongated weld joint discontinuous and prevents the formation of a crack generating zone.
Claim 3
Dependent Claim
21 words
A pipe joint according to claim 1 in which each said hole is sealed to prevent loss of liquid or gas.
Claim 4
Dependent Claim
17 words
A pipe joint according to claim 2 in which sealing is effected without welding in the hole.
Claim 5
Dependent Claim
27 words
A pipe joint according to claim 1 in which the sleeve is two essentially identical sections and each section covers about one-half of the pipe end portions.
Claim 6
Dependent Claim
25 words
A pipe joint according to claim 4 in which the abutting edges of the sections are axially positioned with respect to the pipe end portions.
Claim 7
Dependent Claim
21 words
A pipe joint according to claim 1 in which the means sealing the hole is a plug welded into the hole.
Claim 8
Dependent Claim
29 words
A pipe joint according to claim 6 in which the plug has a head larger than the hole and the periphery of the head is welded to the sleeve.
Claim 9
Dependent Claim
24 words
A pipe joint according to claim 1 in which the means sealing the hole is a plate over the hole welded to the sleeve.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |