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Class 501 - Compositions: ceramic

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176 Subclasses


Subclasses list

Definition

This is the generic class for:

Glass compositions and compositions for making glass, i.e., glass batch compositions, devitrified glass-ceramic compositions and processes for producing such compositions. These compositions may be regarded as thermoplastic compositions.

Refractory compositions comprising primarily earthy, inorganic materials, and/or elemental carbon.

Fired clay containing compositions in the nature of porcelain, earthenware, and similar materials. These compositions may be regarded as thermosetting compositions.

See the Glossary for the definition of the term "ceramic".

Lines with other classes and within this class

Optional ingredients. Disclosures reciting an optional ingredient, such as a statement that a composition includes a range of concentration of the ingredient, including zero percent as the lower end of the range (i.e., containing or comprising 0 - X percent by weight of that ingredient) are classified in a more generic subclass and cross-referenced to an indented subclass which provides for the presence of that ingredient. As an example, a refractory composition which comprises 0 - 10 percent of silicon carbide might be classified as an original in subclass 87 and cross-referenced in subclass 88.

Mol percent and weight percent. When in a disclosure otherwise classifiable in subclasses 54, 55, 73, 121, or 131 recites the concentration of the material specified in the subclass title is in mol percent rather than weight percent, it may be necessary to calculate the equivalent weight percent to classify the disclosure properly.

1. A COMPOUND, PER SE, IS CLASSIFIED IN A COMPOUND CLASS REGARDLESS OF UTILITY.

See References to Other Classes, below, for compound classes.

2. COMPOSITION OR MATERIAL.

A. The rules for determining Class placement of the Original Reference (OR) for claimed chemical compositions are set forth in the Class Definition of Class 252 in the SECTION LINES WITH OTHER CLASSES AND WITHIN THIS CLASS, subsection COMPOSITION CLASS SUPERIORITY, which includes a hierarchical ORDER OF SUPERIORITY FOR COMPOSITION CLASSES.

It is the general rule of classification to classify a process of preparing a composition along with the composition. In those circumstances where only a process of preparing a composition is claimed and there is no claim to a composition, the claim would be classified identically as if it were a composition claim.

B. Lines With Article Or Product Classes.

1. As a general rule, a product (article) is classified with the class specifically providing for the same or a generic class which can take the same.

2. This class (501) provides for an article or product defined in terms of its compositions.

3. An article or product defined by B, 2 above, combined with significant structure for another class will be classified in the class providing for the structure and crossed to Class 501.

4. Subject matter involving multiple claimed inventions--i.e., claims for both Class 501 and those classes in References to Other Classes below that are related to "Composition or Material," section A or section B--will be classified in said class and crossed to Class 501.

See References to Other Classes for article or product classes.

C. PROCESS AND APPARATUS CLASSES

See References to Other Classes, below for process and apparatus classes.

D. SPECIAL CLASSES

See References to Other Classes, below for special classes.

 
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