US3683487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A method of making an inflated product with a bend
Assignee: Individual
•
Filing: 1971-03-24
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Granted: 1972-08-15
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Expires: 1991-03-24
Abstract
Abstract Tube-in sheet material in which the tube is corrugated for enabling forming the material, as by bending, without collapse of the tube, and a method of making such material by inflation of a portion of composite sheet metal stock in dies having a corrugated tube-forming cavity.
Inventors
- 👤 Frederick L Sherman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:51
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/04; B21D53/045
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
158 words
The method of making a composite metal tube-in-sheet material having a bend therein and having a tube formed integrally within said composite material extending around said bend, said method comprising the steps of interfacially bonding two sheets of metal together, placing said bonded metal sheets between die portions which cooperate to form a tubular cavity and which have alternate ridge and valley portions extending transversely of the axis of said tubular cavity defining a corrugated formation as at least part of said tubular cavity, inflating a portion of at least one of said sheets of metal into said tubular cavity to form a tubein-sheet material having a tube extending between said sheets of metal and to provide a corrugated formation in said tube corresponding in shape to said corrugated formation of said tubular die cavity, and forming a bend in said tube-in-sheet material extending through said corrugated formation of said tube transversely of the axis of said tube.
Claim 2
Independent Claim
158 words
The method of making a composite metal tube-in-sheet material having a bend therein and having a tube formed integrally within said composite material extending around said bend, said method comprising the steps of interfacially bonding two sheets of metal together, placing said bonded metal sheets between die portions which cooperate to form a tubular cavity and which have alternate ridge and valley portions extending transversely of the axis of said tubular cavity defining a corrugated formation as at least part of said tubular cavity, inflating a portion of at least one of said sheets of metal into said tubular cavity to form a tubein-sheet material having a tube extending between said sheets of metal and to provide a corrugated formation in said tube corresponding in shape to said corrugated formation of said tubular die cavity, and forming a bend in said tube-in-sheet material extending through said corrugated formation of said tube transversely of the axis of said tube.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein the sheets are solid-phase bonded together.
Claim 4
Dependent Claim
34 words
The method of claim 2 wherein the sheets are green-bonded prior to placement between the dies and heat treated subsequent to formation of the tube having the corrugated formation to improve the green bond.
Claim 5
Dependent Claim
59 words
The method of claim 2 wherein each die is formed with a recess to provide the cavity for expansion of portions of both sheets to form the tube, the recess in each die having a corrugated formation, and said portions of both sheets being inflated to form the tube with a corrugated formation corresponding to that of said recesses.
Claim 6
Dependent Claim
17 words
The method of claim 2 wherein said portion is inflated by forcing a fluid between the sheets.
Claim 7
Dependent Claim
77 words
The method of claim 2 wherein a pattern of a substance containing an oxide is applied to the face of at least one of said sheets in said portion between the dies, said sheets are solid-phase bonded together exclusive of said pattern, and the sheets are heated together in a reducing atmosphere penetrable through at least one of the sheets to reduce the oxide and release a gaseous product for inflating said portion to form the tube.
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |