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2006
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Invention
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Positional multiplex keyway system. A method and apparatus for extending an existing simplex or m... |
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Invention
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Key security method and system. A method and system for securing keys in which all key blanks are... |
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Invention
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Key security method and system.
A method and system for securing keys in which all key blanks ar... |
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1998
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Invention
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Improved door operating system. The present invention relates to a door operating system for cont... |
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1997
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Invention
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Door operating system. The present invention relates to a door operating system for controlling t... |
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Invention
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Method for electromechanical control of the operational parameters of a door in conjunction with ... |
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Invention
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Method for controlling the operational modes of a door in conjunction with a mechanical door cont... |
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1995
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Invention
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Apparatus for selective alteration of operating parameters of a door. Apparatus is are disclosed ... |
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1994
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Invention
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Apparatus and method for selective alteration of operating parameters of a door. Apparatus and me... |
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1988
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Invention
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Hold-open mechanism for use with a door closer. A releasable door hold-open mechanism, for use wi... |
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1987
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Invention
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Door latch. A door latch mechanism mounts on a door for selectively engaging a door strike. A lat... |
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1986
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Invention
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Ring grinding tool. A ring grinding tool suitable for use in grinding or polishing a workpiece, p... |
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1984
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Invention
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Crash bar door locking device. A crash bar door locking device is provided, suited for mounting o... |
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1982
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Invention
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Door closer assist linkage. A control linkage for use with a door closer, wherein the linkage is ... |
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Invention
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Thiolated polypeptide compound derived from a tetanus toxin fragment, the process for its obtenti... |
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1981
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Invention
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Air lock door control apparatus. An air lock has a chamber and a pair of doors in respective wall... |
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1980
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Invention
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Door closer with assist or door operating features. Hydraulic door closer apparatus has associate... |
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1978
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Invention
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Hydraulic door closer construction. A hydraulic door closer is provided with a fluid seal for its... |
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Invention
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Door closer with assist or door operating features. Hydraulic door closer apparatus includes mean... |
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1977
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Invention
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Temperature compensating hydraulic door closer. Hydraulic door closer apparatus comprises a cylin... |
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1976
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Invention
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Piston assembly for door closer. Hydraulic door closer apparatus comprises a cylinder and an elon... |
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1975
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Invention
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Soffit plate and limit stop for use with hydraulic door closer. A resilient element coupled to a ... |
