Reduced pressure device and method of making

Details Reduced pressure device and method of making Reduced pressure device and method of making

1998-05-27

1999-11-23

Speer, Timothy M.

Stock material or miscellaneous articles

Composite

Of metal

428469, 428472, B32B 900

Patent

active

059897228

ABSTRACT:
A reduced pressure device the reduced pressure chamber of which is constructed of stainless steel, and includes a passivation film formed on the exposed interior surface thereof. The film has a thickness more than 50 .ANG. and is composed of two or more layers. One layer contains mainly chrome oxide formed in the vicinity of the interface of the stainless steel and the passivation film. The other layer contains mainly iron oxide formed in the vicinity of the surface of the passivation film. A passivation film may also be used with a thickness of more than 50 .ANG. and containing mainly a mixture of the chrome oxide and the iron oxide. Lastly a passivation film may also be used with thickness of more than 50 .ANG. and containing mainly chrome oxide.

REFERENCES:
patent: 5789086 (1998-08-01), Ohmi

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