US3762448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thick walled pressure vessel
Assignee: Struthers Scientific and International Corp
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Filing: 1970-10-13
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Granted: 1973-10-02
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Expires: 1990-10-13
Abstract
Abstract A thick walled pressure vessel having a tubular wall is prestressed by bending to resist extreme external pressures, the bending being applied by the external pressure being resisted. The tubular or cylindrical wall contains internal axial cuts which divide the wall into axial sectors with faying surfaces therebetween so that the application of external pressure decreases the curvature of the sectors to prestress them.
Inventors
- 👤 J Donohue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:18
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/24; F; F17; F17C; F17C1/00; F17C2201/00; F17C2201/01; F17C2201/0104; F17C2203/00; F17C2203/06; F17C2203/0634; F17C2203/0636; F17C2209/00; F17C2209/22; F17C2209/221; Y; Y10; Y10S; Y10S220/00; Y10S220/29; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
69 words
In a thick walled pressure vessel, a tubular wall for resisting high external pressure, said wall containing internal axial cuts dividing the wall into axial sectors with faying surfaces therebetween, the faying surfaces being sealed at their outer edges at the outer surface of said wall, said sectors elastically bending to decrease their curvature under external pressure to prestress said sectors and thereby said wall of said pressure vessel.
Claim 2
Dependent Claim
69 words
In a thick walled pressure vessel, a tubular wall for resisting high external pressure, said wall containing internal axial cuts dividing the wall into axial sectors with faying surfaces therebetween, the faying surfaces being sealed at their outer edges at the outer surface of said wall, said sectors elastically bending to decrease their curvature under external pressure to prestress said sectors and thereby said wall of said pressure vessel.
Claim 3
Dependent Claim
15 words
The combination according to claim 1 wherein said faying surfaces are closed under external pressure.
Claim 4
Dependent Claim
44 words
The combination according to claim 1 wherein said tubular wall is cylindrical, and wherein said axial sectors when unprestressed have curvatures totalling more than 360* and are elastically bent by external pressure to close said faying surfaces and have curvatures then totalling substantially 360*.
Claim 5
Dependent Claim
71 words
In the process of forming a thick walled pressure vessel having a curved metal closing wall of an integral layer of material wherein the closing wall has axial sectors joined and sealed at their outer edges; abutting the metal closing wall axial sectors leaving open faying surfaces therebetween, and bending the closing wall to decrease its curvature to resist higher external pressures by applying ecternal pressure to close the faying surfaces.
Claim 6
Dependent Claim
71 words
In the process of forming a thick walled pressure vessel having a curved metal closing wall of an integral layer of material wherein the closing wall has axial sectors joined and sealed at their outer edges; abutting the metal closing wall axial sectors leaving open faying surfaces therebetween, and bending the closing wall to decrease its curvature to resist higher external pressures by applying ecternal pressure to close the faying surfaces.
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |