US3660192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making sealing ring with resilient core
Assignee: Ametek Inc
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Filing: 1968-06-19
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Granted: 1972-05-02
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Expires: 1988-06-19
Abstract
Abstract The invention deals with a method of making endless sealing ring members by forming a sleeve element of a solid high molecular weight copolymer of hexafluoropropylene and tetrafluoroethylene into a loop. The ends are butt-welded to form a smooth toroidal ring. A hole is punched in the side through which entrapped fluid is removed and a liquid silicone rubber composition is injected to form a core. The point of injection is sealed and the core material is solidified.
Inventors
- 👤 Robert D Smith
- 👤 Ronald L Herron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:21
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/10; F16J15/108; F16J15/16; F16J15/32; F16J15/328; Y; Y10; Y10S; Y10S277/00; Y10S277/91; Y10S277/935; Y10S277/936; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1036
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
59 words
The process of claim 1 in which a heated fluid is passed through said sleeve element during loop formation, said fluid being maintained at a temperature below, the melting point of the copolymer, high enough to allow plastic deformation of said sleeve element, thereby preventing the formation of irregularities in the surface of said sleeve element during loop formation.
Claim 2
Dependent Claim
117 words
The process of claim 1 further comprising the step of positioning a short auxiliary tubular sleeve element having an outer diameter substantially equal to the inner diameter of said sleeve element within said sleeve element in a manner such as to bridge the gap between the opposed ends of said sleeve element where the opposed ends of said sleeve element are brought together, and wherein the step of butt-welding the opposed ends of said sleeve element is accomplished by heating the abutting ends of said sleeve element and said auxiliary tubular sleeve member until the ends of said sleeve element are fused together to form a bonded joint including the material from said auxiliary tubular sleeve element.
Claim 3
Dependent Claim
24 words
The process of claim 3 further comprising the step of finishing the exterior of said hollow torus to reestablish a uniform outer cross-section dimension.
Claim 4
Dependent Claim
91 words
The process of claim 1 further comprising the steps of: positioning a first auxiliary element within said sleeve element and a second auxiliary element around the exterior of said sleeve element in a manner such that both of said auxiliary elements bridge the gap between the opposed ends of said sleeve element and define an annular region having cross-sectional dimensions substantially the same as the cross-sectional dimensions of said sleeve element when the opposed ends of said sleeve element are brought together, and thereafter removing said auxiliary elements from said torus.
Claim 5
Dependent Claim
15 words
The process of claim 5 wherein said first and second auxiliary elements are tubular elements.
Claim 6
Dependent Claim
66 words
The process of claim 5 wherein said first auxiliary element is made from a dissolvable substance and said second auxiliary element is made from a frangible substance, and wherein the process further comprises the steps of breaking said second auxiliary element and dissolving said first auxiliary element by introducing a solvent for the material from which said first auxiliary element is made into said hollow torus.
Claim 7
Dependent Claim
43 words
The process of claim 7 wherein said first auxiliary element is a thin metallic tube and said solvent comprises an acid which will dissolve the metal from which said metallic tube is made, and wherein said second auxiliary elemeNt is a glass tube.
References Cited (Backward Citations)
US1646356A
Cited
US2442369A
Cited
US2447340A
Cited
US2815966A
Cited
US2717023A
Cited
US2776154A
Cited
US2837360A
Cited
US2893060A
Cited
US2906552A
Cited
US2963394A
Cited
US3258271A
Cited
US3339931A
Cited
US3360273A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |