US PATENT SUBCLASS 313 / 311
DISCHARGE DEVICES HAVING AN ELECTRODE OF PARTICULAR MATERIAL


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

Internet Version by PATENTEC © 1999      Terms of Use



313 /   HD   ELECTRIC LAMP AND DISCHARGE DEVICES

311DISCHARGE DEVICES HAVING AN ELECTRODE OF PARTICULAR MATERIAL


DEFINITION

Classification: 313/311

(under the class definition) Discharge devices which have an electrode defined by the composition of which it is composed.

(1) Note. This subclass provides only for patents for discharge devices but which specify that the device has an electrode formed of a particular composition or material. Electrode composition and materials are classified in Class 252, Compositions, subclasses 500+ or in one of the related classes as pointed out in the class definition. Consequently, patents disclosing electrode compositions and materials for discharge devices are not cross-referenced into this subclass solely for the composition or material, but are cross-referenced in one of the classes specified in the class definitions. However, this subclass does contain some cross-references of patents where the electrode is specified as being made of some well known material, such as brass or zinc which is novel in its relationship in the discharge device although the composition, per se, is not new. This subclass is restricted to disclosures where there is some significance in the use of the particular material or composition in a discharge device.

(2) Note. This subclass includes patents either as originals or cross-references for discharge devices which specify that one electrode is composed of a specified composition or material and another electrode is composed of

a specified composition or material and another electrode is composed of a different composition.

(3) Note. The composition or material may be a coating upon the electrode.

SEE OR SEARCH THIS CLASS, SUBCLASS:

54, where the electrode includes a radio active material. 103+, where the electrode includes a material which emits secondary electrons when bombarded by primary electrons.

107, where the electrode includes a material which does not emit secondary electrons when bombarded by primary electrons.

150, and 163+, where the electrode is a liquid electrode (e.g., mercury).

230, and 359.1+for discharge devices having an evacuated envelope and an electrode which will emit positive ions.

483+, where the electrode includes a fluorescent or phosphorescent material.

523+, where the electrode includes a photo-sensitive material.

559, where the electrode includes a getter material or a material designed to generate a gas or vapor within the envelope of the device.

561, where the device has an envelope which contains a getter or a gas or vapor generating material which is defined by its composition and also has an electrode defined by its composition.

627+, and 630, where the device has an envelope containing a gas or vapor and an electron emissive cathode. See subclasses 627+ where the cathode is a heated or thermionic cathode.

633, where the device is provided with an envelope containing a gas or vapor and has an electrode defined by the composition or material of which it is composed.

SEE OR SEARCH CLASS

252, Compositions, see (1) Note, above.