(under subclass 175) Subject matter comprising methods of attenuating sound.
(1) Note. Methods of this subclass type may attenuate the entire sound or selected frequencies thereof.
(2) Note. Patents claiming both a method of attenuating sound and a product or apparatus for attenuating sound are placed above in the appropriate subclass and cross-referenced here.
(3) Note. Methods of making a sound attenuating product or apparatus are found in the various manufacturing classes involved.
CROSS-REFERENCE ART COLLECTIONS
The following subclasses are collections of published disclosures pertaining to various specified aspects of the acoustic art which aspects do not form appropriate bases for subclasses in the foregoing classification (i.e., subclasses superior hereto in the schedule), wherein original copies of patents are placed on the basis of proximate function of the apparatus. These subclasses assist a search based on remote function of the apparatus and may be of further assistance to the searcher, either as a starting point in further related fields of search inside or outside the class. Thus, there is here provided a second access for retrieval of a limited number of types of disclosure.
(1) Note. Disclosures are placed in these subclasses for their value as references and as leads to appropriate main or secondary fields of search, without regard to their original classification of their claimed subject matter.
(2) Note. The disclosures found in the following subclasses are examples, only of the indicated subject matter, and in no instance do they represent the entire extent of the prior art. (3) Note. Original copies of patents are not placed in the following subclasses.
