Patent US5131697A successfully refreshed from Google Patents.
US5131697A
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Pipe and coupling system
Assignee: AMERICAN FENCE COMPANY Inc A Corp OF
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Filing: 1991-08-12
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Granted: 1992-07-21
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Expires: 2011-08-12
Abstract
Abstract A pipe is especially fabricated for use in conjunction with locking pin type threadless couplings. The pipe has a thin wall configuration achieved by fabricating it from high tensile steel produced by cold working, or reducing, low carbon steel.
Inventors
- 👤 Paul W. Shumway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:02
CPC Classifications
F; F16; F16L; F16L37/00; F16L37/08; F16L37/12; F16L25/00; F16L25/06; F16L25/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
70 words
A pipe and coupling combination in which said coupling is adapted to receive an end of said pipe and having a locking pin means movable radially inwardly of the coupling for engagement with and retention of said pipe, said pipe being characterized by being fabricated from a low carbon steel having a tensile strength in excess of 80,000 p.s.i. achieved by cold reduction without annealing any portion of said pipe.
Claim 2
Dependent Claim
70 words
A pipe and coupling combination in which said coupling is adapted to receive an end of said pipe and having a locking pin means movable radially inwardly of the coupling for engagement with and retention of said pipe, said pipe being characterized by being fabricated from a low carbon steel having a tensile strength in excess of 80,000 p.s.i. achieved by cold reduction without annealing any portion of said pipe.
Claim 3
Dependent Claim
17 words
The combination of claim 1 wherein the pipe steel has a carbon content of 0.0365% or less.
Claim 4
Dependent Claim
21 words
The combination of claim 1 wherein the pipe steel has a yield of from about 80,000 p.s.i. to about 90,000 p.s.i.
Claim 5
Dependent Claim
21 words
The combination of claim 2 wherein the pipe steel has a yield of from about 80,000 p.s.i. to about 90,000 p.s.i.
Claim 6
Dependent Claim
16 words
The combination of claim 1, wherein the pipe steel has a carbon content of approximately 0.010%.
References Cited (Backward Citations)
US2256455A
Cited
US4165892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-21 | 1996-01-20 | 1996-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-21 | 2000-01-20 | 2000-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-21 | 2004-01-20 | 2004-07-21 | $7700.00 | Window Closed / Lapsed |