Operator Means For Cold Frame Or Window Patents (Class 47/903)
  • Patent number: 7739831
    Abstract: A plant protection device having a ventilation opening shield that may be protectedly positioned between a housing and a mounting socket. A temperature sensitive actuator may be provided in the socket and the shield may pivotally move about the socket between a position impeding airflow through the ventilation opening and a position facilitating airflow through the ventilation opening. Various embodiments and features are disclosed including a reinforced housing, multi-part housing construction, and a shield mounting structure provided through the shield, among other features.
    Type: Grant
    Filed: May 2, 2005
    Date of Patent: June 22, 2010
    Inventors: Carl R. Frounfelker, Marina A. Frounfelker