US4240573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of brazing a pressure vessel with thermal release plug
Assignee: Walbro Corp
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Filing: 1976-09-29
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Granted: 1980-12-23
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Expires: 1996-09-29
Abstract
Abstract A fabricated pressure vessel having a heat fusible safety plug. The vessel is made of two or more shell member metalurgically joined together such as by furnace brazing in a protective atmosphere. One of the shell members has a conically shaped well which converges in an inwardly direction and terminates with a small aperture. A lead or other low melting point metal pellet is placed in the well and fused to the well surface during furnace brazing at a temperature greater than twice the melting point temperature of the fusible plug metal.
Inventors
- 👤 Sharon J. Hudson, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:44
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/008
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
121 words
A method of producing a fabricated pressure vessel having an integrally formed thermal release plug, said method comprising the steps of: forming the shell of a pressure vessel from at least two sheet metal members having an overlappping seam, producing at least one apertured well in the wall of one of said members, placing a low melting point metal pellet in said well, placing at least one piece of seam brazing metal adjacent said seam, said brazing metal having a higher melting point than said metal pellet, placing the components in a brazing furnace having a protective atmosphere, and heating said components to brazing temperature to concurrently form a pressure vessel with a brazed seam and a thermal release safety plug.
Claim 2
Independent Claim
121 words
A method of producing a fabricated pressure vessel having an integrally formed thermal release plug, said method comprising the steps of: forming the shell of a pressure vessel from at least two sheet metal members having an overlappping seam, producing at least one apertured well in the wall of one of said members, placing a low melting point metal pellet in said well, placing at least one piece of seam brazing metal adjacent said seam, said brazing metal having a higher melting point than said metal pellet, placing the components in a brazing furnace having a protective atmosphere, and heating said components to brazing temperature to concurrently form a pressure vessel with a brazed seam and a thermal release safety plug.
Claim 3
Dependent Claim
23 words
A method according to claim 1 wherein said brazing temperature is at least three times greater than said plug metal melting point temperature.
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) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |