US4320848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deep drawn and ironed pressure vessel having selectively controlled side-wall thicknesses
Assignee: FACET HOLDING Co Inc
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Filing: 1979-06-07
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Granted: 1982-03-23
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Expires: 1999-06-07
Abstract
Abstract An improved deep drawn and ironed metal shell for use as a pressure vessel having selectively controlled wall thicknesses to impart additional strength to predetermined portions of the improved metal shell. A stepped mandrel is utilized in conjunction with at least one ironing die to fabricate the improved metal shell.
Inventors
- 👤 Richard G. Dye
- 👤 Arthur W. Robichaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:07
CPC Classifications
B; B21; B21D; B21D22/00; B21D22/20; B21D22/24; B21D22/28; Y; Y10; Y10S; Y10S220/00; Y10S220/22
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
102 words
A pressure vessel including a drawn and ironed elongated metal shell with a plurality of stepped internal diameters having a seamless drawn closed end having a first wall thickness, a first axial portion immediately adjacent said closed end having a second wall thickness effected by one of said stepped internal diameters, a second axial portion immediately adjacent said first axial portion and having a third wall thickness effected by another of said stepped internal diameters, and a fourth axial portion immediately adjacent said third axial portion and having a fourth wall thickness effected by a further one of said stepped internal diameters.
Claim 2
Dependent Claim
102 words
A pressure vessel including a drawn and ironed elongated metal shell with a plurality of stepped internal diameters having a seamless drawn closed end having a first wall thickness, a first axial portion immediately adjacent said closed end having a second wall thickness effected by one of said stepped internal diameters, a second axial portion immediately adjacent said first axial portion and having a third wall thickness effected by another of said stepped internal diameters, and a fourth axial portion immediately adjacent said third axial portion and having a fourth wall thickness effected by a further one of said stepped internal diameters.
Claim 3
Dependent Claim
19 words
A pressure vessel as in claim 1, wherein said first wall thickness is equal to said second wall thickness.
Claim 4
Dependent Claim
19 words
A pressure vessel as in claim 1, wherein said first wall thickness is greater than said second wall thickness.
Claim 5
Dependent Claim
21 words
A pressure vessel as in claim 1, wherein said third wall thickness is less than said first or second wall thicknesses.
Claim 6
Dependent Claim
19 words
A pressure vessel as in claim 1, wherein said fourth wall thickness is greater than said third wall thickness.
Claim 7
Dependent Claim
19 words
A pressure vessel as in claim 1, wherein said fourth wall thickness is equal to said first wall thickness.
Claim 8
Dependent Claim
33 words
A pressure vessel as in claim 1, wherein said third wall thickness is less than said first or second wall thicknesses, and said fourth wall thickness is greater than said third wall thickness.
Claim 9
Dependent Claim
19 words
A pressure vessel as in claim 7, wherein said fourth wall thickness is equal to said first wall thickness.
Claim 10
Dependent Claim
30 words
A pressure vessel as in claim 8, wherein said stepped internal diameters are connected internally of the elongated metal shell by an angled step between each of said internal diameters.
Claim 11
Dependent Claim
44 words
A pressure vessel as in claim 9, wherein at least one of said angled steps between said internal diameters is blended at the junction thereof with the adjacent internal diameter and the other portion thereof is a sharp junction with the adjacent internal diameter.
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) | 1985-03-22 | 1985-09-21 | 1986-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-22 | 1989-09-21 | 1990-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-22 | 1993-09-21 | 1994-03-23 | $7700.00 | Window Closed / Lapsed |