US PATENT SUBCLASS 418 / 55.1
.~ Helical working member, e.g., scroll

Current as of: June, 1999
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418 /   HD   ROTARY EXPANSIBLE CHAMBER DEVICES

54  DF  WORKING MEMBER HAS PLANETARY OR PLANETATING MOVEMENT {6}
55.1.~ Helical working member, e.g., scroll {5}
55.2  DF  .~.~> Having specific wrap or end plate, e.g., shape, material, coating
55.3  DF  .~.~> With specific rotation preventing or rotation coupling means
55.4  DF  .~.~> With mechanical sealing
55.5  DF  .~.~> With biasing means, e.g., axial or radial
55.6  DF  .~.~> With lubricant, liquid seal or nonworking fluid separation

DEFINITION

Classification: 418/55.1

Helical working member, e.g., scroll:

(under subclass 54) Apparatus in which the working member includes continuous working portions in the form of a spiral either (1) lying in the same plane and having increasing radius or (2) extending axially.