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In re Duncan

46 App. D.C. 57, 1917 U.S. App. LEXIS 2504
CourtCourt of Appeals for the D.C. Circuit
DecidedFebruary 5, 1917
DocketNo. 1056
StatusPublished

This text of 46 App. D.C. 57 (In re Duncan) is published on Counsel Stack Legal Research, covering Court of Appeals for the D.C. Circuit primary law. Counsel Stack provides free access to over 12 million legal documents including statutes, case law, regulations, and constitutions.

Bluebook
In re Duncan, 46 App. D.C. 57, 1917 U.S. App. LEXIS 2504 (D.C. Cir. 1917).

Opinion

Mr. Justice Van Orsdel

delivered the opinion of the Court:

This is urn. appeal by Harry L. Duncan from the decision of the Commissioner of Patents rejecting claims 4, 5, 10, 11, 11, and 18 of an application for a process patent. The general scope of the rejected claims is shown by the following three claims:

“4. The process of producing metallic nitride which consists in supplying the carbonaceous charge of material to a rotatingTouting kiln and thereby agitating and feeding said charge through said kiln, in supplying combustible nitrogenous treating gas to the discharge end of said kiln to maintain a nitrogenous reducing atmosphere therein, in injecting substantially axially into said kiln a jet of air engaging said gas and forming therewith a substantially centralized heating flame transmitting heat to the material and kiln walls Avithout undesirable contact therewith, and in bringing said material when highly heated into engagement with said nitrogenous treating gas to convert the same into nitride.”
“10. The process of producing aluminum nitride which consists. in supplying the carbonaceous aluminous charge of ma[59]*59ferial to a rotating treating kiln and thereby agitating and feeding said charge through said kiln, in supplying to the discharge end of said kiln combustible nitrogenous treating gas to maintain a nitrogenous reducing atmosphere in the discharge end of said kiln, in injecting into said kiln an oxidizing jet engaging said treating gas and forming therewith a heating flame transmitting heat to the material and kiln walls without destructive action thereon to heat said material and effect its conversion into nitride by contact with said treating gas.”
“17. The process of producing aluminum nitride which consists in supplying the carbonaceous charge of material to a rotating treating kiln and thereby agitating and feeding said material through said kiln, in supplying combustible -nitrogenous treating gas to said kiln adjacent its discharge end to maintain therein a nitrogenous reducing atmosphere, in preventing undesirable ingress of air to the lower end of said kiln adjacent the kiln walls and said material, in injecting into said kiln a jet of air engaging said gas and forming therewith a substantially centralized heating flame transmitting heat to the material and kiln walls without undesirable contact therewith, and in bringing said material while highly heated into engagement with said nitrogenous treating gas to convert the same into aluminum nitride.”

The invention is described in appellant’s application as follows : “'This invention relates especially to processes for producing nitrides of aluminum and other metals by supplying the liot carbonaceous aluminous charge of material, for instance, to a rotating treating kiln, through which it is gradually fed and simultaneously agitated. The material may be beated by supplying to the discharge end of the kiln a low-pressure diffused heating jet or stream of luminous flame producer-gas and injecting substantially axially into the kiln a high-pressure jet of air or other oxidizer, engaging said heating stream and forming therewith a substantially centralized beating flame transmitting heat to the kiln walls and material, while kept from undesirable contact therewith by the layer of dead wall gases in engagement with the kiln walls and material.”

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46 App. D.C. 57, 1917 U.S. App. LEXIS 2504, Counsel Stack Legal Research, https://law.counselstack.com/opinion/in-re-duncan-cadc-1917.