Patent US3794359A successfully refreshed from Google Patents.
US3794359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasion resistant pipe fitting
Assignee: AO Smith Inland Inc
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Filing: 1972-10-30
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Granted: 1974-02-26
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Expires: 1992-10-30
Abstract
Abstract A tubular pipe fitting adapted to withstand abrasive and corrosive attack in changing the direction of fluid flowing therein. The fitting is made of a plurality of wear plates of ceramic material molded or cast to a semi-circular shape and assembled in circumferentially spaced opposed relationship in the area of the fitting subject to attack. Grout consisting of a mixture of epoxy resin and metallized ceramic pellets is disposed in semi-circular form in the circumferential space between the opposed wear plates and longitudinally of the fitting fiber glass filaments impregnated with resin which surround the wear plates and grout, and the entire assembly is cured to present a completed fitting.
Inventors
- 👤 J Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:05
CPC Classifications
F; F16; F16L; F16L57/00; F16L57/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
135 words
In a pipe fitting adapted to change the direction of the flow of an abrasive fluid therein, a pair of semi-circular wear plates of a non-metallic material processed at elevated temperatures to the proper shape and disposed substantially opposite each other with the inner ends of the plates circumferentially spaced apart from each other and disposed to form that part of the fitting which will be subjected to the greatest abrasive and corrosive attack by the fluid flowing in the fitting, a grout mixture of resin and compatible abrasive material disposed in the circumferential space between the wear plates in semi-circular form to match the contour of the wear plates and complete the inner portion of the fitting, and resin and fiber glass cured around the wear plates and grout to provide a composite fitting.
Claim 2
Dependent Claim
135 words
In a pipe fitting adapted to change the direction of the flow of an abrasive fluid therein, a pair of semi-circular wear plates of a non-metallic material processed at elevated temperatures to the proper shape and disposed substantially opposite each other with the inner ends of the plates circumferentially spaced apart from each other and disposed to form that part of the fitting which will be subjected to the greatest abrasive and corrosive attack by the fluid flowing in the fitting, a grout mixture of resin and compatible abrasive material disposed in the circumferential space between the wear plates in semi-circular form to match the contour of the wear plates and complete the inner portion of the fitting, and resin and fiber glass cured around the wear plates and grout to provide a composite fitting.
Claim 3
Dependent Claim
49 words
The pipe fitting of claim 1 in which the wear plates are of ceramic and the abrasive material of the grout is in the form of ceramic pellets with at least a part of the surfaces of the pellets coated with a metal disposed to adhere to the resin.
Claim 4
Dependent Claim
142 words
A pipe fitting elbow having a body portion and end portions adapted to change the direction of flow of an abrasive fluid therein, which comprises a plurality of ceramic wear plates, positioned within the body portion and at the end portions, formed to the shape of the fitting and provided by a set of inner wear plates and a set of outer wear plates disposed opposite each other, with one set circumferentially spaced from the other set and located in that portion of the elbow subjected to the greatest abrasive and corrosive attack in service, and a grout mixture of resin and compatible metallized ceramic pellets extending around the elbow in the space between said plates to complete the semi-circular inner portion of the pipe, and cured thermosetting resin and fiber glass extending around the plurality of inner and outer wear plates.
Claim 5
Dependent Claim
142 words
A pipe fitting elbow having a body portion and end portions adapted to change the direction of flow of an abrasive fluid therein, which comprises a plurality of ceramic wear plates, positioned within the body portion and at the end portions, formed to the shape of the fitting and provided by a set of inner wear plates and a set of outer wear plates disposed opposite each other, with one set circumferentially spaced from the other set and located in that portion of the elbow subjected to the greatest abrasive and corrosive attack in service, and a grout mixture of resin and compatible metallized ceramic pellets extending around the elbow in the space between said plates to complete the semi-circular inner portion of the pipe, and cured thermosetting resin and fiber glass extending around the plurality of inner and outer wear plates.
Claim 6
Dependent Claim
33 words
The pipe fitting of claim 3 in which the wear plates at the respective ends of the fitting are of lesser thickness than the wear plates forming the body of the pipe fitting.
Claim 7
Dependent Claim
44 words
The pipe fitting of claim 3, and a grout mixture of resin and metallized ceramic pellets disposed at the outer circumferential juncture of the thinner end wear plates and thicker body wear plates to provide a fillet pReventing a sharp step between the plates.
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |