Patent US3620357A successfully refreshed from Google Patents.
US3620357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conveyors
Assignee: Dunlop Holdings Ltd
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Filing: 1969-11-24
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Granted: 1971-11-16
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Expires: 1989-11-24
Abstract
Abstract Support system for a conveyor belt, the belt formed of flexible material having a layer of magnetized material on one surface. The magnetized layer cooperates with a support provided with means for forming a magnetic field, such as a further layer of magnetized material, which field repels the belt, of which the following is a specification.
Inventors
- 👤 Hugh L Folkes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:38
CPC Classifications
B; B65; B65G; B65G15/00; B65G15/60; B65G21/00; B65G21/02; B66; B66B; B66B23/00; B66B23/08; B66B23/10; B66B23/22; B66B23/24; B65G2201/00; B65G2201/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
80 words
A conveyor comprising an endless belt, drive means for the belt, and support means positioned adjacent the lower surface of belt for at least part of at least one run of the belt; the belt comprising a flexible polymeric material having a reinforcement embedded therein and a layer of material having a magnetizable material dispersed therein and extending the length of the belt; the support means including means to produce a magnetic field whereby repulsion of the belt is produced.
Claim 2
Dependent Claim
80 words
A conveyor comprising an endless belt, drive means for the belt, and support means positioned adjacent the lower surface of belt for at least part of at least one run of the belt; the belt comprising a flexible polymeric material having a reinforcement embedded therein and a layer of material having a magnetizable material dispersed therein and extending the length of the belt; the support means including means to produce a magnetic field whereby repulsion of the belt is produced.
Claim 3
Dependent Claim
29 words
A belt as claimed in claim 1, wherein the magnetizable material comprises at least one material selected from the group consisting of barium ferrite, lead ferrite and strontium ferrite.
Claim 4
Dependent Claim
35 words
A conveyor as claimed in claim 1, wherein the support means comprises at least one rigid support plate having an upper surface layer of magnetized material to produce the magnetic field to repel the belt.
Claim 5
Dependent Claim
28 words
A conveyor as claimed in claim 1 wherein two or more rigid support plates are provided and at least one support roller is provided between adjacent support 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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |