US4778074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite material and metal canister
Assignee: Northrop Grumman Innovation Systems LLC
•
Filing: 1987-07-08
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Granted: 1988-10-18
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Expires: 2007-07-08
Abstract
Abstract A composite material and metal canister has a cylindrical corrosion resistant metal shell and a composite material bulkhead within the shell which provides corrosion resistance and minimal weight coupled with the ability to withstand high internal pressures and bending stresses. The metal shell and the composite bulkhead are joined by a circumferential compression exerted on the shell by an external ring of shape memory material to produce a fluid-tight seal therebetween the shell and an adjacent bulkhead. A pair of composite material bulkheads and a pair of shape memory material rings can be used to seal both ends of the shell by locating an inner bulkhead and an external ring at respective ends of the shell.
Inventors
- 👤 Charles J. Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:38
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/20; H01M50/233; H01M50/24; H01M50/202; H01M50/218; H01M50/22; H01M50/222; H01M50/224; H01M50/262; H01M50/271; H01M50/273; H01M50/276; H01M50/278; H01M50/28; H01M50/296; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
52 words
A canister comprising a cylindrical shell made of stainless steel, a bulkhead of a corrosion resistant composite material located within said shell across one end of said shell, and a compression ring of shape memory material arranged to apply a compressive stress to said shell to join said shell to said bulkhead.
Claim 2
Dependent Claim
52 words
A canister comprising a cylindrical shell made of stainless steel, a bulkhead of a corrosion resistant composite material located within said shell across one end of said shell, and a compression ring of shape memory material arranged to apply a compressive stress to said shell to join said shell to said bulkhead.
Claim 3
Dependent Claim
18 words
A canister as set forth in claim 1 wherein said bulkhead is made of a graphite/epoxy thermoset material.
Claim 4
Dependent Claim
18 words
A canister as set forth in claim 1 wherein said bulkhead is made of a graphite/PPS thermoplastic material.
Claim 5
Dependent Claim
54 words
A canister as set forth in claim 1 and further inculding a second bulkhead of a corrosion resistant composite material located across a second end of said shell and a second compression ring of shape memory material arranged to apply a compressive stress to said shell to join said shell to said second bulkhead.
Claim 6
Dependent Claim
26 words
A canister as set forth in claim 4 wherein said shell is made of stainless steel and said bulkheads are made of a graphite/glass thermoset material.
Claim 7
Dependent Claim
26 words
A canister as set forth in claim 4 wherein said shell is made of stainless steel and said bulkheads are made of a graphite/PPS thermoplastic material.
Claim 8
Dependent Claim
53 words
A canister as set forth in claim 4 and including a first cup within said shell holding said first bulkhead and in peripheral contact with said shell facing said first ring and a second cup within said shell holding said second bulkhead and in peripheral contact with said shell facing said second ring.
Claim 9
Dependent Claim
22 words
A canister as set forth in claim 7 wherein said first and second cups and said shell are made of stainless steel.
Claim 10
Dependent Claim
29 words
A canister as set forth in claim 1 and further including a cup within said shell holding said bulkhead and in peripheral contact with said shell facing said ring.
Claim 11
Dependent Claim
49 words
A canister as set forth in claim 9 and including a pair of electrical leads extending through said bulkhead and said cup and a pair of glass-to-metal seals arranged to seal respective ones of said leads to said bulkhead and said cup while providing electrical isolation of said leads.
Claim 12
Dependent Claim
19 words
A canister as set forth in claim 9 wherein said shell and said cup are made of stainless steel.
Claim 13
Dependent Claim
36 words
A canister as set forth in claim 1 and including a pair of electrical leads extending through said bulkhead and a pair of glass-to-composite seals arranged to seal respective ones of said leads to said bulkhead.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |