US3848289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scraper blade
Assignee: SPX Technologies Inc
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Filing: 1973-04-16
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Granted: 1974-11-19
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Expires: 1993-04-16
Abstract
Abstract A scraper blade is made from polyphenylene sulfide (PPS) and uniformly filled with a reinforcing filler such as short glass fibers. The blade has a scraping edge of substantially 90* included angle and both front and back surfaces of the blade can be provided with such perpendicular edges. The blade can be turned so that all four scraping edges can be utilized.
Inventors
- 👤 T Bachmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:59
CPC Classifications
F; F28; F28F; F28F21/00; F28F21/06; F28F21/067; F28F19/00; F28F19/008; F28G; F28G3/00; F28G3/10; F28G3/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
In a scraped-surface apparatus comprising a fluid container having a substantially cylindrical wall, a rotatable shaft disposed axially thereof defining an annUlar fluid chamber for holding fluid being treated, and one or more scrapers driven by said shaft extending outwardly thereof and including outer edges for scraping fluid from the inside surface of said cylindrical wall, each scraper defining an acute angle with respect to a tangent drawn at its point of contact with said wall, the improvement wherein each scraper comprises a blade of a polyphenylene sulfide material filled throughout the entire blade with a reinforcing filler, said scraping edge having a substantially perpendicular included angle.
Claim 2
Dependent Claim
107 words
In a scraped-surface apparatus comprising a fluid container having a substantially cylindrical wall, a rotatable shaft disposed axially thereof defining an annUlar fluid chamber for holding fluid being treated, and one or more scrapers driven by said shaft extending outwardly thereof and including outer edges for scraping fluid from the inside surface of said cylindrical wall, each scraper defining an acute angle with respect to a tangent drawn at its point of contact with said wall, the improvement wherein each scraper comprises a blade of a polyphenylene sulfide material filled throughout the entire blade with a reinforcing filler, said scraping edge having a substantially perpendicular included angle.
Claim 3
Dependent Claim
26 words
The improvement of claim 1 herein said filler is selected from a group consisting of glass fiber, asbestos, mica, polytetrafluoroethylene and fibers of potassium titanate crystals.
Claim 4
Dependent Claim
23 words
The improvement of claim 1 wherein said scraper has a second edge useful as a scraping edge having a substantially perpendicular included angle.
Claim 5
Dependent Claim
22 words
The improvement of claim 1 wherein said scraper has four edges useful as scraping edges each having a substantially perpendicular included angle.
Claim 6
Dependent Claim
18 words
The improvement of claim 1 wherein the material of said blade is substantially uniformly filled with reinforcing filler.
Claim 7
Dependent Claim
20 words
The improvement of claim 5 wherein said filler is glass fibers constituting approximately 40 percent dry weight of said material.
References Cited (Backward Citations)
US2711552A
Cited
FR1183901A
Cited
US3395419A
Cited
US3737411A
Cited
US3731339A
Cited
US3728313A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |