Sifting screen
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United States of America Patent
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May 6, 1997
Grant Date -
N/A
app pub date -
Aug 29, 1995
filing date -
Mar 3, 1994
priority date (Note) -
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Abstract
A sifting screen having a rigid frame, a first woven cloth of hard wearing metal wire, stretched thereacross and secured thereto, and a second woven cloth having a coarser mesh than the first cloth and being woven from an elongate material of greater cross-section than the first, also stretched across the frame, and secured thereto, below the first cloth, to support the latter against sagging. In accordance with the invention, at least the wearing surface of the material from which the lower cloth is woven is selected to be significantly less hard wearing than that from which the upper cloth is woven, so that wear due to rubbing and vibration during use, occurs to a greater extent in the lower cloth than in the upper cloth. In one example the upper cloth is woven from stainless steel wire and the lower from phosphor bronze wire. In another example the lower cloth is of wire having a coating of an epoxy based material, or TEFLON.TM., or Molybdenum Disulphide. In another example the lower cloth is formed from a plastics material or KEVLAR.TM. or carbon fiber. The frame may be formed from glass reinforced gas blown polypropylene reinforced by elongate metal reinforcing elements or rods.
First Claim
Family
- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- UNITED WIRE LIMITED
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Cook, Gordon J | Newtonhill, GB6 | 7 | 263 |
Hughes, Andrew | Edinburgh, GB6 | 60 | 457 |
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Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
---|---|---|---|
Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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