Description: 429 chemistry: electrical current producing apparatus, product, and process / 429 chemistry: electrical current producing apparatus, product, and process/(72) having specified venting, feeding or circulation structure (other than feeding or filling for activating deferred action-type battery) (74) having means to control electrolyte level when liquid is added, other than a visual reference point (77) by establishing an air lock (78) liquid seal only
Hierarchy/Derived subclasses
uspto searches
Patent Apps in 429/78
Granted Patents in 429/78
Use the links above or do an advanced search in
ppubs for:
(429/78.ccls.)
This will show what classes derive from the input. Ex: entering 43/42.24 shows the derived classes and the search that can be used to find
patents or patent applications in those subclasses.