Patent US3731339A successfully refreshed from Google Patents.
US3731339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scraper assembly for process vessels
Assignee: Sunoco Inc
•
Filing: 1971-09-29
•
Granted: 1973-05-08
•
Expires: 1991-09-29
Abstract
Abstract A rotating scraper blade, for use in a process vessel containing liquid, is driven by a hollow shaft whose ends are sealed off from the liquid, thereby to entrap air in the hollow interior of the shaft and provide a buoyant effect on the scraper assembly. There may be additional supports for the blade, in the form of pipes whose ends are similarly sealed off from the liquid, and secured to the driving shaft.
Inventors
- 👤 C Addison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:27
CPC Classifications
F; F28; F28F; F28F19/00; F28F19/008
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
123 words
A scraper assembly for use in scraping the inner wall of a substantially cylindrical process vessel containing a liquid, comprising a scraper blade adapted to scrape the inner cylindrical wall of said vessel, a hollow shaft mounted axially of said vessel for supporting and rotating said blade about the vessel longitudinal axis, the interior of said shaft being sealed off from said liquid, thereby to entrap air in the hollow interior of such shaft; an elongated support member extending parallel to said shaft, means securing said support member to said shaft, and means coupling said blade to said support member, said support member being hollow and being sealed off from said liquid, thereby to entrap air in the hollow interior of such member.
Claim 2
Dependent Claim
123 words
A scraper assembly for use in scraping the inner wall of a substantially cylindrical process vessel containing a liquid, comprising a scraper blade adapted to scrape the inner cylindrical wall of said vessel, a hollow shaft mounted axially of said vessel for supporting and rotating said blade about the vessel longitudinal axis, the interior of said shaft being sealed off from said liquid, thereby to entrap air in the hollow interior of such shaft; an elongated support member extending parallel to said shaft, means securing said support member to said shaft, and means coupling said blade to said support member, said support member being hollow and being sealed off from said liquid, thereby to entrap air in the hollow interior of such member.
Claim 3
Dependent Claim
26 words
Assembly of claim 1, wherein the means coupling the blade to the support member comprises a leaf spring mounted between the blade and the support member.
Claim 4
Dependent Claim
143 words
A scraper assembly for use in scraping the inner wall of a substantially cylindrical process vessel containing a liquid, comprising a pair of scraper blades adapted to scrape the inner cylindrical wall of said vessel, a hollow shaft mounted axially of said vessel for supporting and rotating said blades about the vessel longitudinal axis, the interior of said shaft being sealed off from said liquid, thereby to entrap air in the hollow interior of such shaft; a pair of elongated support members extending parallel to said shaft on respective opposite sides thereof, means securing each of said support members to said shaft, and means coupling each of said blades to a respective one of said support members, each of said support members being hollow and being sealed off from said liquid, thereby to entrap air in the hollow interior of each such member.
Claim 5
Dependent Claim
143 words
A scraper assembly for use in scraping the inner wall of a substantially cylindrical process vessel containing a liquid, comprising a pair of scraper blades adapted to scrape the inner cylindrical wall of said vessel, a hollow shaft mounted axially of said vessel for supporting and rotating said blades about the vessel longitudinal axis, the interior of said shaft being sealed off from said liquid, thereby to entrap air in the hollow interior of such shaft; a pair of elongated support members extending parallel to said shaft on respective opposite sides thereof, means securing each of said support members to said shaft, and means coupling each of said blades to a respective one of said support members, each of said support members being hollow and being sealed off from said liquid, thereby to entrap air in the hollow interior of each such member.
Claim 6
Dependent Claim
28 words
Assembly of claim 3, wherein the means coupling each blade to a respective support member comprises a leaf spring mounted between each blade and a respective support member.
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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |