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:
Apr. 27, 1976
Filed:
May. 07, 1974
Otto A Oshida, Fountain Valley, CA (US);
John B Gilmour, Whittier, CA (US);
Nadeem U Siddiqui, Torrance, CA (US);
Grefco, Inc., Los Angeles, CA (US);
Abstract
Monolithic acoustical panels are provided including relatively coarse particles of expanded volcanic glass, such as perlite, and mineral fiber. The panel provides a highly porous structure that possesses desirable noise suppression characteristics, and comprises by weight 45 to 75% of an expanded volcanic glass of which 65-100% will pass an 8 mesh U.S. Standard screen and will be retained on a 50 mesh U.S. Standard screen; 10 to 30% of mineral fiber; 10 to 20% of nongelatinous cellulosic fiber having lengths in the range of about 0.5 to 3.5 mm.; and a total of 10 to 25% of binder and sizing agent.