US PATENT SUBCLASS 454 / 290
.~.~.~ Having adjustable valve


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

Internet Version by PATENTEC © 1999      Terms of Use



454 /   HD   VENTILATION

254  DF  HAVING INLET AIRWAY {11}
284  DF  .~ Including specific air distributor (e.g., register, etc.) {14}
289  DF  .~.~ Floor type {2}
290.~.~.~ Having adjustable valve


DEFINITION

Classification: 454/290

Having adjustable valve:

(under subclass 289) Subject matter comprising a positively repositionable device for regulating the quantity of airflow.