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It turns out that the term for what we were discussing is hydrostatic pressure. A patent For a suit they call an anthropomorphic tank suit to do what i suggested is here http://www.surechem.org/index.php?Action=document&docId=1291491&db=USPTO&tab=desc&lang=&db_query=2%3A0%3A&markupType=all
I will paste some of it here. It's more complicated than we thought. Isn't it always.
'As shown in Holste, U.S. Pat. No. Re 22,101; Beall, U.S. Pat. No. 2,335,474; Gray, U.S. Pat. No. 3,089,482; Kops et al., U.S. Pat. No. 3,124,123; Gongwer, U.S. Pat. No. 3,137,290; it has long been known that surrounding the body with a fluid will counteract the g-load effect. When subjected to acceleration, the fluid exerts a hydrostatic pressure on the user's body, squeezing the lower extremities and preventing the blood from "pooling". The fluid also squeezes the user's chest making it difficult to inhale. The increased fluid pressure on the chest, can be offset by providing the user with pressurized breathing gases which help counteract the fluid pressure on the chest wall. In most aircraft, pressurized gases are supplied to the user when the aircraft reaches a predetermined altitude. These systems are inadequate for g-protection because they are responsive to ambient pressure and not g-forces. If the user is at low altitude and is subjected to g-loads, no pressurized breathing is provided to overcome the increased hydrostatic fluid pressure. Providing a constant supply of pressurized gases is also inadequate. For example, if the gas pressure is set to overcome fluid pressure at 4 g's, it would provide too much pressure at 1 g, making it difficult for the user to exhale. Therefore, there is a need for a fluid filled g-suit having a regulator that supplies, and instantaneously changes the pressure of breathing gases supplied to the user, as a function of acceleration and ambient pressure.'
'SUMMARY OF THE INVENTION
This invention is a fluid filled integrated anthropomorphic g-suit, with means for protecting the user of the suit from hostile environments. A regulator instantaneously responsive to g-loads is operatively connected to the fluid, such that the user is provided with a supply of pressurized breathing gases that will offset the increased hydrostatic pressure of the fluid on the user's chest, when the user is subjected to high g-loads.'
'Another object is to have a g-suit that will provide a user, instantaneous protection from the effects of acceleration.'
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