3699481 is referenced by 3 patents and cites 11 patents.

This invention discloses a class of materials having a cellular structure which is suitable to slow the movement or velocity of elastic waves therein. An example of this class of materials is a cellular phenolic honeycomb polymer in which an elastic wave has a delay time of 0.6 milliseconds per inch in contrast to a delay time of 0.005 milliseconds per inch obtained in quartz, the most widely used prior art material. By proper modification of the cellular structure parameters, that is, the thickness of the individual cell wall and the dimensions of the individual cell, a particular desired elastic wave velocity in a given direction can be obtained.

Title
Low velocity highly anisotropic elastic materials
Application Number
05/148,766
Publication Number
3699481
Application Date
June 1, 1971
Publication Date
October 17, 1972
Inventor
Lim Teong C
Kraut Edgar A
Thompson Donald O
Thompson Robert B
Assignee
North American Rockwell Corporation
IPC
H03h 07/30
E04b 01/86
E04B 01/74
H03H 09/00
H03H 09/36
G10K 11/00
E04B 01/84
G10K 11/18
E04B 01/86
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