3661688 is referenced by 26 patents and cites 2 patents.

A composite board product according to the present invention is formed from a core of coarse wood components disposed between a pair of cellulosic fiber webs. This assembly is compressed to consolidate the board product and to provide an indented margin thereupon. The board product is provided with a rounded shoulder where the margin joins the rest of the product in order to preserve the continuity of the tough skin formed by a cellulosic fiber web. The margin edge is preferably rounded off on the side of the board product opposite the indented margin, and the tough skin formed by the remaining cellulosic fiber web is folded over. After trimming, only a narrow edge of doubly densified wooden core is exposed to the weather.

Title
Composite board laminate
Application Number
05/012,356
Publication Number
3661688
Application Date
February 18, 1970
Publication Date
May 9, 1972
Inventor
Wheeler Robert G
Assignee
Wood Process Oregon
IPC
B32b 03/30
B32b 03/02
E04C 02/24
E04C 02/10
E04C 02/16
B27N 03/06
B27N 03/00
View Original Source