US PATENT SUBCLASS 165 / 269
.~.~ Duty cycle (e.g., pulse duration or pulse frequency modulation, etc.)

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

Internet Version by PATENTEC © 1999      Terms of Use


165 /   HD   HEAT EXCHANGE

200  DF  WITH TIMER, PROGRAMMER, TIME DELAY, OR CONDITION RESPONSIVE CONTROL {14}
267  DF  .~ Means to heat or cool for predetermined periods of time (e.g., duty cycle, time-temperature profiler, etc.) {2}
269.~.~ Duty cycle (e.g., pulse duration or pulse frequency modulation, etc.)

DEFINITION

Classification: 165/269

Duty cycle (e.g., pulse duration or pulse frequency modulation, etc.):

(under subclass 267) Subject matter wherein said instrument outputs a plurality of electrical pulses to actuate the heat transfer apparatus in a pulsed manner, said pulses being of extremely short duration (e.g., less than one second, etc.) and the frequency, duration or ratio of on-to-off time of the pulse within a given time interval is controlled by the instrument.

SEE OR SEARCH CLASS

236, Automatic temperature and humidity regulation,

46, for automatic temperature and humidity control devices with timer other than clock.

251, Valves and Valve Actuation,

129.05, for electrically actuated valves having means to produce digital pulses.