Electric heating – Inductive heating – With heat exchange
Reexamination Certificate
1999-09-30
2001-09-18
Leung, Philip H. (Department: 3742)
Electric heating
Inductive heating
With heat exchange
C219S603000, C219S085120, C219S635000, C210S493500, C419S048000, C392S418000, C228S124600, C228S121000
Reexamination Certificate
active
06291806
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to bonding and more particularly to an article and method for bonding a first workpiece to a second workpiece by localized heating.
2. Background of the Invention
The prior art has known various types of apparatuses and methods for bonding a first workpiece to a second workpiece. One popular method of affixing a first workpiece to a second workpiece is through the use of a brazing material. In a brazing process, a brazing material is disposed between a first and a second workpiece. When the brazing material and the first and second workpiece is elevated to a higher temperature, the brazing material liquifies to bond to the first and second workpiece. Upon solidification upon the removal of heat, the brazing material solidifies for bonding the first workpiece to the second workpiece. In general, the brazing material is a different material than the first and second workpieces thereby having a lower melting temperature. This ensures that the brazing will liquify upon the application of heat prior to any melting or liquefication of the first and second workpiece. Accordingly, the first and second workpieces are maintained intact and are not adversely affected by the application of heat.
Another type of process of bonding a first and second workpiece involves a welding process. In a welding process, a portion of a first and a second workpiece is liquified or melted with the liquified material from the first and second workpieces being allowed to co-mingle as a liquid. Upon the removal of heat, the co-mingled liquified materials are solidified thereby bonding the first workpiece to the second workpiece. The welding process has distinctive advantage over the brazing process in that the bond between the first and second workpieces are formed from the same material as the first and second workpieces. Secondly, the bond between the first and second workpieces is essentially as strong as the workpieces themselves. An unfortunate occurrence of the welding process is the deformation or partial melting or liquefication of a portion of each of the first and second workpieces.
Others in the prior art have used a sinter bond between metallic filter media and another metal component of a filter assembly. The sinter bond was produced by joining the parts through a diffusion bonding membrane. The membrane comprised a web of small diameter metal fibers which were sinter bond to both the filter media and the other filter part. Although the sinter bond provided an adequate bond between the filter media and another metal component of a filter assembly, the bond did not have sufficient strength for many operations and uses.
U.S. Pat. No. 2,642,187 to Bell discloses a replaceable filter unit of the character described comprising a pleated filter body of resin-impregnated paper arranged in tubular form and with the pleats extending substantially radially, end discs of the same material as the filter body closing off opposite ends of the body, said discs being bonded by a thermosetting resin adhesive to opposite end edges of said pleats, said adhesive lying between under faces of said discs and corresponding end edges of said pleats in contact therewith, and having turned down rims bonded adhesively by thermosetting resin adhesive to folds of the pleats, said adhesive lying between inner faces of the turned down rims and the folds of the pleats in contact therewith.
U.S. Pat. No 2,877,903 to Veres discloses a unit for filtering particulate matter from a fluid flowing therethrough, a hollow filter body comprising a screen equipped with a screen closure at one end thereof, a cap substantially closing the other end of said screen body and defining connecting means for communicating the interior of said filter body with a fluid flow line, and a mass of pellets defining a substantially continuous coating along the outer surface of the screen end closure and screen body and being bonded to each other and to the screen body and end closure to form an integrated structure therewith, whereby both said screen body and screen end closure define filtering areas through which fluid may pass to the interior of the screen body.
U.S. Pat. No. 2,957,235 to Steinberg discloses a method of assembling first and second elements composed of a mixture of powdered metal and resinous binder comprising placing said first element on a support, heating said first element until said resin binder therein becomes pliable without the element losing shape, placing said second element against said first element, applying pressure to said second element until a bond is formed by the resinous binder between said first and second elements, removing the elements from said support, cooling the assembly of said elements, supporting said assembly with sinter material in a sintering zone, and sintering said assembly into a unitary sintered structure.
U.S. Pat. No. 3,379,000 to Webber et al discloses a tow of metal filaments each having a maximum cross-section of less than approximately 10 microns and a length of approximately 50 feet and having a trace amount of a different material diffused in the outer surface thereof.
U.S. Pat. No. 3,490,902 to Fisher discloses a method for forming porous structures useful, for example, as filters, diffusion membranes, sound absorbers, and the like. The structures contain a sintered metal portion at least one surface of which having embedded and bonded thereto a reinforcing member. Some of the fibers in the fiber metal portion are bonded to each other and to the reinforcing member.
U.S. Pat. No. 3,505,038 to Luksch et al. discloses a mass comprising a plurality of randomly disposed hair-like substantially solid metal fibers, wherein said fibers are substantially free from particles of degradation and air transportable, and wherein said mass has resilient loft, substantial uniformity of density and distribution of voids, handlable green strength, and a density range of from one percent to eighty-five percent.
U.S. Pat. No. 3,716,347 to Bergstrom et al. discloses metal parts joined together with sintered powdered metal by applying a mixture of powdered metal and an organic heat-fugitive binder to the parts at the locus of the joint to be formed therebetween, assembling the parts in their desired joined configuration, and heating the assembly to volatilize or burn-off the binder and sinter the powdered metal.
U.S. Pat. No. 4,114,794 to Storms discloses an autogenous or sinter bond between metallic filter media and other metal components of a filter assembly is produced by joining the parts through a diffusion bonding membrane. The membrane comprises a web of small diameter metal fibrils which will sinter bond to both the filter media and the other filter parts to form a physically strong and leak-free seal.
U.S. Pat. No. 4,169,059 to Storms discloses an autogenous or sinter bond between metallic filter media and other metal components of a filter assembly is produced by joining the parts through a diffusion bonding membrane. The membrane comprises a web of small diameter metal fibrils which will sinter bond to both the filter media and the other filter parts to form a physically strong and leak-free seal.
U.S. Pat. No. 4,290,889 to Erickson discloses a new and unique means for preventing the crowns of a backflushable filter element unit from splitting which has heretofore been caused by the cyclic action of the cleaning and backflushing. A layer of staple material is positioned adjacent the outer layer of filter media to prevent bellowing or ballooning. An additional staple layer may be positioned adjacent the inner layer of filtered media to provide additional support. With both staple layers in position on both sides of the filter media, the media is firmly captured and the crowns will not split.
U.S. Pat. No. 4,676,843 to Nazmy discloses two component workpieces consisting of different superalloys or of the same superalloy are bonded together to form a monolithic whole, with the insertion of a layer consisting of a powder of compos
Li Tao
Malanga Robert
Quick Nathaniel R.
Frijouf Rust & Pyle P.A.
Leung Philip H.
USF Filtration and Separations Group Inc.
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