US PATENT SUBCLASS 264 / 36.17
.~.~.~ By application of internal fluid pressure differential to permanently shape, distort, or sustain material to repair or restore pipes or tubes (e.g., flexible bladder, expandable tubular pig, etc.)

Current as of: June, 1999
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264 /   HD   PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES

36.1  DF  REPAIRING OR RESTORING CONSUMER USED ARTICLES FOR REUSE {7}
36.15  DF  .~ Hollow- or container-type articles (e.g., vase, pipes, cups, tubes, etc.) {1}
36.16  DF  .~.~ Pipes or tubes {1}
36.17.~.~.~ By application of internal fluid pressure differential to permanently shape, distort, or sustain material to repair or restore pipes or tubes (e.g., flexible bladder, expandable tubular pig, etc.)

DEFINITION

Classification: 264/36.17

By application of internal fluid pressure differential to permanently shape, distort, or sustain material to repair or restore pipes or tubes (e.g., flexible bladder, expandable

tubular pig, etc.):

(under subclass 36.16) Processes, wherein a positive or negative pressure is internally applied to renewing or reconditioning material through the medium of a liquid or gas in direct or indirect contact therewith to shape or maintain a desired configuration.