04145001 is referenced by 102 patents and cites 5 patents.

A package having plural layers with a quantity of volatile substance such as deodorizer sandwiched between the layers. The outer layers of the laminate are impermeable to the substance and its vapors, and thus prevent escape of the vapors as long as the package is sealed. Upon opening of the package, delamination occurs at the interface between two selected layers such that the volatile substance is covered on one side only by a layer of material which is permeable to the vapors, thereby allowing controlled release of the vapors over a period of time. A process for production of such packages is also disclosed.

Title
Packaging for controlled release of volatile substances
Application Number
5/833500
Publication Number
4145001
Application Date
September 15, 1977
Publication Date
March 20, 1979
Inventor
Don W Seidler
Appleton
WI, US
Robert J Weyenberg
Appleton
WI, US
Agent
Harry C Engstrom
Ira S Dorman
Robert P Auber
Assignee
American Can Company
CT, US
IPC
A61L 9/04
View Original Source