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Quietized Typewriter Platen

IP.com Disclosure Number: IPCOM000090348D
Original Publication Date: 1969-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 62K

Publishing Venue

IBM

Related People

Cassell, JN: AUTHOR

Abstract

Typing sound level is significantly reduced, particularly in the high-frequency band, by filling a paper support platen with urethane foam material. Satisfactory results are obtained with fillings of both rigid and flexible urethane foam having densities of between 4 and 6 pounds per cubic foot and filled in sufficient quantity to generate some low internal pressure when foaming into a closed platen in steps 2 and 3.

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Quietized Typewriter Platen

Typing sound level is significantly reduced, particularly in the high-frequency band, by filling a paper support platen with urethane foam material. Satisfactory results are obtained with fillings of both rigid and flexible urethane foam having densities of between 4 and 6 pounds per cubic foot and filled in sufficient quantity to generate some low internal pressure when foaming into a closed platen in steps 2 and 3.

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