US PATENT SUBCLASS 52 / 2.16
.~ Fluid pressure is subatmospheric

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


52 /   HD   STATIC STRUCTURES (E.G., BUILDINGS)

2.11  DF  SHAPED OR STRENGTHENED BY FLUID PRESSURE {11}
2.16.~ Fluid pressure is subatmospheric

DEFINITION

Classification: 52/2.16

Fluid pressure is subatmospheric:

(under subclass 2.11) Structure wherein the enclosed fluid is at a pressure which is less than that of the ambient air; i.e., a vacuum of one degree or another has been established.

(1) Note. The density of certain materials can be increased by subjecting them to a vacuum.