Releasable locking system
Patent 4320844 Issued on March 23, 1982. Estimated Expiration Date: 
March 23, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 23, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorApplicationNo. 05/803998 filed on 06/06/1977US Classes:215/260, With pressure-responsive valve215/217, Closure guided in simultaneous turning and reciprocating movememnt (e.g., screw threaded)215/342, Spring biased215/343Depending sealing rib engages receptacle topExaminersPrimary: Shoap, Allan N.Attorney, Agent or FirmInternational ClassesB65D 50/04 (20060101)B65D 50/00 (20060101) Foreign Application Priority Data1976-06-10 GBAbstractA container closure system such that an uninstructed person would find it difficult to remove the closure. Helical screw threads on the container and on the one-piece closure have detents and discrete thread portions engageable under the influence of a spring means once the closure has been screwed onto (cap) or into (stopper) the container to a certain extent. Unscrewing can only be effected by firstly overcoming the spring means to separate the locking detents/thread portions and subsequently turning the closure while continuing to overcome said spring means.Field of SearchClosure guided in simultaneous turning and reciprocating movememnt (e.g., screw threaded)Closure threaded to receptacle and/or rotatable closure removal obstruction Quick removal (e.g., bayonet) With means to prevent unintentional rotation in closure releasing direction Removably attached to receptacle by relative rotation between keepers (e.g., screw threads or lugs) Cap skirt impressed with circumferential inclined keeper indent, or with circumferentially spaced keeper indents Keeper formed by inward facing beads spaced along lower edge of cap skirt With pressure-responsive valve Receptacle interior communicable with exterior with closure in applied position (e.g., vented) Spring actuated Spring biased Depending sealing rib engages receptacle top | |
