(under subclass 500) Subject matter wherein a primary combustible material providing said flame is in the form of a liquid or gas.
(1) Note. While many of the patents relating to open front liquid and gaseous fuel heating stoves in subclasses 86+ and 93+ of this class (126) may belong under subclasses 500+ of this class in a hierarchical placement of patents, subclasses 86+ and 93+ were not made a part of or screened in this project gathering art relating to fireplaces. Thus, subclasses 86+ and 93+ must be searched for patents relating to viewable fires having a liquid or gaseous fuel.
SEE OR SEARCH THIS CLASS, SUBCLASS:
503, for condition responsive control of the rate of flow of fluid fuel.
