US PATENT SUBCLASS 250 / 231.1
.~.~.~ Actuated by dynamic external physical quantity

Current as of: June, 1999
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250 /   HD   RADIANT ENERGY

200  DF  PHOTOCELLS; CIRCUITS AND APPARATUS {11}
216  DF  .~ Optical or pre-photocell system {11}
229  DF  .~.~ Light valve (e.g., iris diaphragm) {3}
231.1.~.~.~ Actuated by dynamic external physical quantity {4}
231.11  DF  .~.~.~.~> Actuated by gauge element deflection
231.12  DF  .~.~.~.~> Gyroscopes
231.13  DF  .~.~.~.~> Shaft angle transducers {1}
231.19  DF  .~.~.~.~> Pressure-responsive light valves

DEFINITION

Classification: 250/231.1

Actuated by dynamic external physical quantity:

(under subclass 229) Subject matter in which the means in the optical path between the light source and the photocell for varying the amount of light which reaches the photocell is actuated by an external mechanical force.

(1) Note. Examples of dynamic type physical quantities include pressure, weight (mg where m = mass of an object andg = gravitational force), force (f) where f = ma or f = 1/2 mv squared), deflection of an object connected to the means in the optical path for varying the amount of light reaching the photocell, speed of an object, velocity of an object (including fluid flow), position (angular or linear) of an object.

(2) Note. Measurement of the position of an object properly classified herein is distinct from the position indication classified in this class, subclasses 206.1+ in that the latter concerns global position of a target whereas this subclass concerns local position, e.g., rotation of a shaft about an axis where the shaft's global position is known or not of concern.

(3) Note. Excluded from the definition of dynamic type physical quantities are electrical quantities, e.g., current, voltage, impedance; chemical properties; passive physical quantities and forces, such as color, temperature, physical dimensions (length, width, diameter, Coriolis force); and quantum mechanical forces and properties.

SEE OR SEARCH CLASS

33, Geometrical Instruments,

363, for electrical telemetering with a photoelectric pickoff; and subclass 707 for distance measuring including optical means. 73, Measuring and Testing,

290, for measuring and testing involving, inter alia, radiant energy detection; and subclass 705 for photoelectric fluid projection gauges.

324, Electricity: Measuring and Testing,

96+, for measurement, testing or sensing of electricity using radiant energy; and subclass 344, for use of a radiant energy receiver for a geological measurement or test.

356, Optics: Measuring and Testing, for measurement of passive physical forces such as color (

402+, ); temperature (subclasses 43+), and physical dimensions (subclasses 2, 3+, 27+, 345+, 123, 124+, 372+, 388+, 247+, etc..).

374, Thermal Measuring and Testing,

32, 121+, and 162 for various temperature measuring means or methods.

396, Photography,

106+, for automatic camera focussing using active ranging.

434, Education and Demonstration,

1+, for electromagnetic sensors to detect or determine the range of an object; subclass 187 for measurement of length or volume; and subclass 303, for science, physics or optics. 435, Chemistry: Molecular Biology and Microbiology,

808, for optical sensing apparatus.

436, Chemistry: Analytical and Immunological Testing,

164+, for analytical chemical testing by optical means and involving a chemical reaction.

702, Data Processing: Measuring, Calibrating, or Testing, appropriate subclasses.