US3858911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piping system
Assignee: Nibco Inc
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Filing: 1972-12-06
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Granted: 1975-01-07
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Expires: 1992-12-06
Abstract
Abstract A piping system consisting of a thin walled steel pipe having a galvanized coating on the external and internal surfaces and a plain end, a copper or bronze fitting, valve, adapter or the like, and having a cup for receiving the plain end of the pipe, and a metallurgical bond formed by soldering or brazing between the cup and the galvanized coating on the plain end of the pipe. Notwithstanding the lower thermal conductivity constant of the steel pipe, the relatively small mass afforded by the thin walled structure of the pipe minimizes the difference in the effect of thermal conductivity between the steel and the copper or bronze fitting, and hence results in an effective, reliable joint in a minimum amount of heating and cooling time. The joint between the thin walled pipe and the copper or bronze fitting can easily be made using standard soldering and brazing technique and compounds, the system is adapted to perform effectively under the same conditions as the conventional copper piping system and at a lower installation cost.
Inventors
- 👤 Lee Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:49
CPC Classifications
F; F16; F16L; F16L13/00; F16L13/08; F16L55/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
100 words
A piping system comprising a thin walled steel pipe having a galvanized coating and a plain end, said coating extending along the entire interior and exterior cylindrical surfaces of said pipe, a fitting composed of a copper based metal and having a thin walled cup for receiving the plain end of said pipe, and a bonding material forming a metallurgical bond containing an alloy of zinc and iron between said steel pipe and said copper based metal, the diameter of said pipe ranging from 3/8 inches to 4 inches and the wall thicknesses thereof ranging between 0.022 and 0.095 inches.
Claim 2
Dependent Claim
100 words
A piping system comprising a thin walled steel pipe having a galvanized coating and a plain end, said coating extending along the entire interior and exterior cylindrical surfaces of said pipe, a fitting composed of a copper based metal and having a thin walled cup for receiving the plain end of said pipe, and a bonding material forming a metallurgical bond containing an alloy of zinc and iron between said steel pipe and said copper based metal, the diameter of said pipe ranging from 3/8 inches to 4 inches and the wall thicknesses thereof ranging between 0.022 and 0.095 inches.
Claim 3
Dependent Claim
99 words
A PIPING SYSTEM COMPRISING A THIN WALLED STEEL PIPE HAVING A GALVANIZED COATING AND A PLAIN END, SAID COATING EXTENDING ALONG THE ENTIRE INTERIOR AND EXTERIOR CYCLINDRICAL SURFACES OF SAID PIPE, A FITTING COMPOSED OF A COPPER BASED METAL AND HAVING A THIN WALLED CUP FOR RECEIVING THE PLAIN END OF SAID PIPE, AND A BONDING MATERIAL FORMING A METALLURGICAL BOND CONTAINING AN ALLOY OF ZINC AND IRON BETWEEN SAID STEEL PIPE AND COPPER BASED METAL, THE DIAMETER OF SAID PIPE RANGING FROM 3/8 INCHES TO 4 INCHES AND THE WALL THICKNESSES THEREOF RANGING BETWEEN 0.022 AND 0.095 INCHES.
Claim 4
Dependent Claim
99 words
A PIPING SYSTEM COMPRISING A THIN WALLED STEEL PIPE HAVING A GALVANIZED COATING AND A PLAIN END, SAID COATING EXTENDING ALONG THE ENTIRE INTERIOR AND EXTERIOR CYCLINDRICAL SURFACES OF SAID PIPE, A FITTING COMPOSED OF A COPPER BASED METAL AND HAVING A THIN WALLED CUP FOR RECEIVING THE PLAIN END OF SAID PIPE, AND A BONDING MATERIAL FORMING A METALLURGICAL BOND CONTAINING AN ALLOY OF ZINC AND IRON BETWEEN SAID STEEL PIPE AND COPPER BASED METAL, THE DIAMETER OF SAID PIPE RANGING FROM 3/8 INCHES TO 4 INCHES AND THE WALL THICKNESSES THEREOF RANGING BETWEEN 0.022 AND 0.095 INCHES.
Claim 5
Dependent Claim
37 words
A piping system as defined in claim 1 in which the galvanized coating on said pipe is essentially zinc and a soldering compound is used to form the metallurgical bond between the zinc coating and the fitting.
Claim 6
Dependent Claim
37 words
A piping system as defined in claim 1 in which the galvanized coating on said pipe is essentially zinc and a brazing compound is used to form the metallurgical bond between the zinc coating and the fitting.
Claim 7
Dependent Claim
14 words
A piping system as defined in claim 1 in which said fitting is copper.
Claim 8
Dependent Claim
14 words
A piping system as defined in claim 1 in which said fitting is bronze.
Claim 9
Dependent Claim
28 words
A piping system as defined in claim 1 in which the material used in forming said metallurgical bond consists essentially of 50 percent tin and 50 percent lead.
Claim 10
Dependent Claim
28 words
A piping system as defined in claim 1 in which the material used in forming said metallurgical bond consists essentially of 95 percent tin and 5 percent antimony.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |