Patents by Inventor Peter H. Field

Peter H. Field has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Pin tumblers and corresponding keys for cylinder locks
    Patent number: 5289709
    Abstract: A tumbler pin tip and key surface are configured so that when engaged, the tumbler pin tip fully and precisely seats in the key bitting, and thus is rotationally positioned at a predetermined location. The contacting surfaces are generally sloped from one edge of the tumbler (and key surface) to the other in tapered form and the sloping surface may be flat, concave, convex or a combination as disclosed.
    Type: Grant
    Filed: October 24, 1991
    Date of Patent: March 1, 1994
    Assignee: Medeco Security Locks, Inc.
    Inventor: Peter H. Field
  • Cylinder lock with changeable keyway
    Patent number: 5088306
    Abstract: A cylinder lock is capable of providing a changeable keyway by means of elongated warding members which are insertable into a keyway access slot which has a cross-sectional configuration larger than for a desired key. There may be one or more warding members which are insertable into the plug and extend the length of the keyway access lot to define the cross-sectional area of a desired key.
    Type: Grant
    Filed: October 31, 1989
    Date of Patent: February 18, 1992
    Assignee: Medeco Security Locks, Inc.
    Inventor: Peter H. Field
  • Dropbolt lock assembly
    Patent number: 5044181
    Abstract: A dropbolt lock having a pair of dropbolts movable between knuckles is assembled on a formed steel assembly plate which is attached to a base plate, the assembly plate providing the spaced knuckles. A cam operator operates the dropbolts between true dead lock positions. On the inside of the lock, a cylinder lock or a thumb turn may be assembled by a single screw. The cover is provided with attachment screws which are concealed by the locking bolt when in locked position.
    Type: Grant
    Filed: March 22, 1990
    Date of Patent: September 3, 1991
    Assignee: Medeco Security Locks, Inc.
    Inventors: Stevie C. Roop, Peter H. Field
  • Dropbolt lock
    Patent number: D324480
    Type: Grant
    Filed: March 22, 1990
    Date of Patent: March 10, 1992
    Assignee: Medeco Security Locks, Inc.
    Inventors: Stevie C. Roop, Peter H. Field