US3750698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated valving member
Assignee: Xerox Corp
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Filing: 1972-03-23
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Granted: 1973-08-07
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Expires: 1992-03-23
Abstract
Abstract All areas of the butterfly type valving member which may be exposed to attach by corrosive substances, are coated with a protective material of the class of tetrafluoroethylene or equivalent substance, by a high-pressure and high-temperature molding process; the process involving withdrawing support from a journal end of the valving member during a critical phase of the molding procedure to ensure adequate coating of said journal end including the customary turning center hole thereof.
Inventors
- 👤 D Walchle
- 👤 P Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:22
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/14; B29C45/14336; B29C45/14344; F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F16K27/00; F16K27/02; F16K27/0209; F16K27/0218; B29L; B29L2031/00; B29L2031/748; B29L2031/7506; F02; F02D; F02D9/00; F02D9/08; F02D9/10; F02D9/107; Y; Y10; Y10T; Y10T137/00; Y10T137/6851; Y10T137/7036
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
149 words
A butterfly-type valving member comprising a substantially flat, circular, substantially rigid, metal body plate, a pair of axially aligned cylindrical shaft sections integral with the body plate and located at opposite ends of a diameter or chord thereof, one of which sections is a stud shaft having a terminal end, and the other of which constitutes an actuating stem having an outer end for engagement with an actuator to actuate the valve, a plurality of spaced apart openings through said plate, and a protective coating material molded on said plate, said stud shaft, and said stem, and conforming to all surfaces of said plate and said stud shaft and all surfaces of said stem except said outer end, said coating filling and extending through said openings to integrally attach the coating on opposite sides of the plate, said coating material being characterized by wearresistance, corrosion-resistant and inherently self-lubricating properties
Claim 2
Dependent Claim
149 words
A butterfly-type valving member comprising a substantially flat, circular, substantially rigid, metal body plate, a pair of axially aligned cylindrical shaft sections integral with the body plate and located at opposite ends of a diameter or chord thereof, one of which sections is a stud shaft having a terminal end, and the other of which constitutes an actuating stem having an outer end for engagement with an actuator to actuate the valve, a plurality of spaced apart openings through said plate, and a protective coating material molded on said plate, said stud shaft, and said stem, and conforming to all surfaces of said plate and said stud shaft and all surfaces of said stem except said outer end, said coating filling and extending through said openings to integrally attach the coating on opposite sides of the plate, said coating material being characterized by wearresistance, corrosion-resistant and inherently self-lubricating properties
Claim 3
Dependent Claim
23 words
The valving member as defined by claim 1, wherein said coating material is a material of the class of tetrafluoroethylene or the like.
Claim 4
Dependent Claim
32 words
The valving member as defined by claim 1, wherein said stud shaft and said stem are roughened to enhance adherence of said coating material and to oppose displacement of said material thereon.
Claim 5
Dependent Claim
43 words
The valving member as defined by claim 1, wherein said openings through said body plate comprise a central aperture, and a plurality of circumferentially spaced apertures adjacent to the periphery of said plate, all of said apertures being filled with the coating material.
Claim 6
Dependent Claim
57 words
A butterfly-type valve as in claim 1, wherein said stem includes a reduced diameter portion between the body plate and the outer end of the stem defining a recessed area on the stem, said coating material filling said recess to define a substantially flush outer surface on said stem, said coating being injection molded on said valve.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |