Inventor’s Corner

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The container enables chemicals to be received and unloaded without the threat of contamination in a facility that may not have cleanrooms. It is a double-layered structure with a flexible outer shell and inner bag. It has a filling nozzle at the top and unloading outlet at the bottom. The unloading outlet has a blade cover with an attached rope so that the outer shell unloading outlet can be positioned away from the lower end of the inner bag and secured to an unloading frame. An inner bag unloading spout cover is then secured to the outer surface of a receiving sleeve. After the unloading spout has been secured, a sealed end of the inner bag unloading spout is opened using the container receiving sleeve cap, and the filled material is then unloaded.
Patent number: 6,132,090
Date granted: October 17, 2000
Inventor: Kimiyuki Hashimoto,
Nippon Unicar Co. Ltd (Japan)

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Cleanroom chair
The chair is specifically designed for use in a cleanroom and limits the emission of particles when personnel alternately sit down and stand up.

The chair includes a base and a seat member mounted on the base. The seat, in turn, includes a cushion that is encapsulated by a shell. The shell is made of polytetrafluoroethylene (PTFE).

Encapsulating a foam rubber cushion in a PTFE shell limits emission of particles by the cushion.
Patent number: H1,874
Date granted: October 3, 2000
Inventor: Gennaro Nicholas DeSantis, SHE-America Inc. (Vancouver, WA)

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Chemical sterilization method
This invention is a method for sterilizing chemical compositions within a closed container. Initially, the chemical composition is mechanically filtered and then containers are closed and hermetically sealed within a first sealing layer. The first sealing layer and the chemical container form a single layer sealed enclosure, which is then encased within a second sealing layer and hermetically sealed to form a second layer sealed container enclosure. The second layer sealed container enclosure is then inserted into a carton having a third sealing layer lining. The carton is closed and then irradiated with gamma radiation at a predetermined dosage level to sterilize the contents of the container. The closed cartons are then transported to operational sites where the plurality of sealing layers provide for optimized contamination reduction.
Patent number: 6,123,900
Date granted: September 26, 2000
Inventor: Arthur L. Vellutato, Veltek Associates Inc. (Phoenixville, PA)

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Air filter
The air filter removes gaseous organic impurities in cleanrooms or wet benches where semiconductors and liquid crystal displays are manufactured. The filter has a mechanism that circulates humidified air. A hydrophobic zeolite layer at the base of the filter traps particles and gaseous organic impurities, both of which can be removed without lowering the humidity of circulating air. Because the filter does not contain activated charcoal, it is not flammable. These filters along with other particle filters can be installed safely in the ceiling portion of the air cleaning apparatus.
Patent number: 6,120,584
Date granted: September 19, 2000
Inventors: Soichiro Sakata, Katsumi Sato,
Hideto Takahashi, Takasago Thermal Engineering Co. (Tokyo)

Send your inventions
Information on the patents highlighted was obtained through the U.S. Patent and Trademark Office. Inventors who have been granted patents within the last six months for new cleanroom and contamination technology are encouraged to submit them to CleanRooms magazine for publication. Send a brief description of the invention along with a detailed drawing to Mark A. DeSorbo, associate editor, CleanRooms, 98 Spit Brook Road, Nashua, NH 03062, or e-mail at [email protected].


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