US PATENT SUBCLASS 313 / 568
.~ Having a particular total or partial pressure

Current as of: June, 1999
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313 /   HD   ELECTRIC LAMP AND DISCHARGE DEVICES

567  DF  WITH GAS OR VAPOR {24}
568.~ Having a particular total or partial pressure {4}
569  DF  .~.~> Incandescent lamp
570  DF  .~.~> Greater than 760 torr {1}
572  DF  .~.~> One torr thru 760 torr {2}
577  DF  .~.~> Less than .1 torr

DEFINITION

Classification: 313/568

Having a particular total or partial pressure:

(under subclass 567) Subject matter wherein the gas or vapor pressure within the envelope is stated as being a specific pressure or in a range of pressures.

(1) Note. The unit of pressure, torr, is the same as a millimeter of pressure.

(2) Note. The patents are placed on the basis of the highest pressure of the total or the partial pressure recited in the claim.

(3) Note. Here are patents which include a gas or vapor fill of less than one torr, but greater than .1 torr.

SEE OR SEARCH THIS CLASS, SUBCLASS:

233, for a lamp or discharge device which is defined in terms of the degree of vacuum within the envelope of the lamp or discharge device. However, claims reciting a gas or vapor at less than 0.1 torr are classified in subclass 577.

549, for a lamp or discharge device having a heating means to control the gas or vapor pressure within the envelope of the lamp or discharge device. 552, for a lamp or discharge device having means to control the gas or vapor pressure within the envelope of the lamp or discharge device, using the heat developed in the operation of the lamp or discharge device.

637, for a lamp or discharge device having a particular gas or vapor including mixtures of gases or vapors.