06168048 is referenced by 30 patents and cites 21 patents.

Briefly, this invention uses one or more pressure vessels having installed therein on its inside a balloon of flexible and non-expandable wall to smoothly and continuously deliver a chemical to any end user without contamination and gas dissolution. Since the balloon installed inside the pressure vessel isolates a high pressure gas from the chemicals, gas dissolution in the chemical and the resulted gas bubble problems are effectively eliminated. Further, contaminants in the high pressure gas which fills the balloon will not be transferred into the chemical and the extremely toxic chemical will not be transferred into the gas to be exhausted as a serious environmental issue. Unlike the vacuum/pressure system, the contamination by the ambient air leaking into the system is avoided because the disclosed delivery system is always with the pressure higher or equal to the ambient pressure.

Title
Methods and systems for distributing liquid chemicals
Application Number
9/158740
Publication Number
6168048 (A)
Application Date
September 22, 1998
Publication Date
January 2, 2001
Inventor
Xavier Vigor
Chicago
IL, US
Mindi Xu
Naperville
IL, US
Agent
Jeffrey L Wendt
US
Assignee
American Air Liquide
CA, US
IPC
G01F 11/00
View Original Source