Patent US5597630A successfully refreshed from Google Patents.
US5597630A
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Seamless, tapered tubular member
Assignee: Individual
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Filing: 1995-02-08
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Granted: 1997-01-28
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Expires: 2015-02-08
Abstract
Abstract An elongated, tapered seamless and hollow tubular member of net shape is disclosed. The tubular member is made by a method comprising providing an elongated, tapered mandrel, applying a composite material consisting of reinforced fibers with a resin on the mandrel, providing a shell having an elongated, tapered bore, inserting the mandrel with the composite material applied thereon into the bore of the shell to provide a mold assembly, heating the mold assembly, displacing the mandrel and shell longitudinally toward each other to compress the composite material of the article being formed by simultaneously applying a tensile force at one end of the mandrel and a compressive force at the other, allowing the mold assembly to cool, and then separating the shell and mandrel from the molded article.
Inventors
- 👤 Harold P. Hogarth
- 👤 Wayne E. Hogarth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:59
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/30; B29C70/34; B29C70/345; B29C53/00; B29C53/56; B29L; B29L2023/00; B29L2023/22; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1362; Y10T428/1369; Y10T428/139; Y10T428/1393
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
172 words
A seamless, elongated, tapered, tubular member of net shape having a length of 3 to 90 feet and a diameter of 0.1 inches to 4 feet, said tubular member formed by a method comprising the steps of: providing an elongated, tapered mandrel; applying a composite material consisting of a matrix of reinforcing fibers combined with a resin material onto said mandrel; providing a one piece shell having an elongated, tapered bore; inserting said mandrel with said composite material applied thereon into said bore of said shell to provide a mold assembly; heating said mold assembly; applying a tensile force at one end of said mandrel while simultaneously applying a compressive force at the other end of said mandrel; displacing said mandrel and shell longitudinally toward each other under said tensile force and said compressive force to compress said composite material; allowing said mold assembly to cool while continuing to apply said tensile and compressive forces on said composite material; separating said shell and mandrel and removing said tubular member from said mandrel.
Claim 2
Dependent Claim
172 words
A seamless, elongated, tapered, tubular member of net shape having a length of 3 to 90 feet and a diameter of 0.1 inches to 4 feet, said tubular member formed by a method comprising the steps of: providing an elongated, tapered mandrel; applying a composite material consisting of a matrix of reinforcing fibers combined with a resin material onto said mandrel; providing a one piece shell having an elongated, tapered bore; inserting said mandrel with said composite material applied thereon into said bore of said shell to provide a mold assembly; heating said mold assembly; applying a tensile force at one end of said mandrel while simultaneously applying a compressive force at the other end of said mandrel; displacing said mandrel and shell longitudinally toward each other under said tensile force and said compressive force to compress said composite material; allowing said mold assembly to cool while continuing to apply said tensile and compressive forces on said composite material; separating said shell and mandrel and removing said tubular member from said mandrel.
Claim 3
Dependent Claim
27 words
An article according to claim 1 wherein the method further comprises the step of removing gases entrapped in said composite material prior to heating said mold assembly.
Claim 4
Dependent Claim
16 words
An article according to claim 1 wherein said shell comprises reinforcing fibers impregnated with a resin.
Claim 5
Dependent Claim
21 words
An article according to claim 3 wherein said shell is formed of a material similar to the composite material being molded.
Claim 6
Dependent Claim
18 words
An article according to claim 3 wherein said composite material includes at least two layers of reinforcing fibers.
Claim 7
Dependent Claim
21 words
An article according to claim 3 wherein said fibers are selected from the group consisting of graphite, boron, glass and aramid.
Claim 8
Dependent Claim
12 words
An article according to claim 5 wherein said fibers are oriented unidirectionally.
Claim 9
Dependent Claim
12 words
An article according to claim 5 wherein said fibers are oriented multidirectionally.
Claim 10
Dependent Claim
46 words
An article according to claim 3 wherein said resin is selected from the group consisting of phenolic resins, alkyds, amino resins, polyesters, epoxies, polyurethanes, phenolfurfural resins, cellulose acetates, cellulose nitrates, bismaleimide resins, polyolefins, polyfluorocarbons, vinyl polymers, polystyrene, acrylics, nylon, polycarbonates, silicones cellulose ethers and cellulose esters.
Claim 11
Dependent Claim
31 words
An article according to claim 3 wherein said composite material is applied to the mandrel as a tape comprising a plurality of longitudinally disposed resin forcing fibers embedded in a resin.
Claim 12
Dependent Claim
25 words
An article according to claim 3 wherein said composite material includes at least two layers each layer comprising woven fibers impregnated with a thermosetting material.
References Cited (Backward Citations)
US3974012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-01-28 | 2000-07-29 | 2001-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-01-28 | 2004-07-29 | 2005-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-01-28 | 2008-07-29 | 2009-01-28 | $7700.00 | Window Closed / Lapsed |