US PATENT SUBCLASS 441 / 28
.~.~ Having ballast means


Current as of: June, 1999
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441 /   HD   BUOYS, RAFTS, AND AQUATIC DEVICES

1  DF  BUOY {6}
21  DF  .~ Having means to control attitude or position {3}
28.~.~ Having ballast means {1}
29  DF  .~.~.~> Variable ballast


DEFINITION

Classification: 441/28

Having ballast means:

(under subclass 21) Buoy wherein the means to control the vertical, horizontal, or rotational movement includes a heavy material intended to alter the draft or stability of the buoy.