The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 09, 2002
Filed:
Feb. 24, 2000
Hidenao Kawasaki, Toyokawa, JP;
Osamu Kawasaki, Toyokawa, JP;
Abstract
A ceramics sound absorption material made of a ceramics block which is obtained by adding a combustible pore-forming material to at least one selected from refractory clay and refractory chamotte and calcining the blend, which has communicating pores having a main pore diameter of 0.2 to 2,000 &mgr;m, which has an air permeability of at least 1 cm ·cm/cm ·sec·cmH O, and in which surface a large number of sound absorption holes or sound absorption grooves are formed, a glaze being applied to only the surface except the inner peripheral surfaces and the bottom surfaces of the sound absorption holes or the sound absorption grooves to form a glaze layer which fills the communicating pores and which is substantially free from an air permeability. The porous ceramics sound absorption material is excellent in sound absorption characteristics and a weatherability, and is less stained in particular. Stains once adhered are easily removed, and a good appearance can be maintained for a long period of time.