US3572073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of shaping a thin-walled body
Assignee: Individual
•
Filing: 1969-03-10
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Granted: 1971-03-23
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Expires: 1989-03-10
Abstract
Abstract A method of shaping a body includes putting a preform into a mold and heating the assembly to produce and increase pressure within the preform causing the preform to expand and conform to the shape of the interior of the mold.
Inventors
- 👤 Walter B Dean
- 👤 Harry P Schane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:06
CPC Classifications
B; B21; B21D; B21D26/00; B21D26/02; B21D26/033; B21D26/049
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
130 words
A method of shaping a thin metallic body comprising the steps of providing a preform of said body to be shaped, completely enclosing said preform except for an opening adapted to be connected to a source of pressurized gas, providing a mold having an interior surface shaped to the form to which said metallic body is to be shaped, inserting said preform into said mold, delivering a predetermined amount of said pressurized gas into the interior of said enclosed preform through said opening, closing said opening and maintaining said gas under a fixed pressure within said preform, heating said preform to cause the gas to expand to increase the pressure within said container causing said preform to expand and conform to the shape of the interior surface of said mold.
Claim 2
Independent Claim
130 words
A method of shaping a thin metallic body comprising the steps of providing a preform of said body to be shaped, completely enclosing said preform except for an opening adapted to be connected to a source of pressurized gas, providing a mold having an interior surface shaped to the form to which said metallic body is to be shaped, inserting said preform into said mold, delivering a predetermined amount of said pressurized gas into the interior of said enclosed preform through said opening, closing said opening and maintaining said gas under a fixed pressure within said preform, heating said preform to cause the gas to expand to increase the pressure within said container causing said preform to expand and conform to the shape of the interior surface of said mold.
Claim 3
Dependent Claim
35 words
A method as set forth in claim 1 wherein the additional step is provided of relieving any trapped air between said preform and the interior surface of said mold during the expansion of said preform.
Claim 4
Dependent Claim
39 words
The invention as set forth in claim 2 wherein the additional step is provided of enclosing said preform by applying a plate with an aperture therein to close an open area of said preform to form a gastight enclosure.
Claim 5
Dependent Claim
48 words
The invention as set forth in claim 3 wherein a two-piece mold is provided with one of the pieces being provided with an opening to permit said pressurized gas to be delivered from said source through said opening and through the aperture of said plate into said enclosure.
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) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |