Patents by Inventor James F. Blair

James F. Blair 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).

  • Patent number: 6091441
    Abstract: A distribution amplifier (210) for a cable television system (100) includes an output gain stage section (215) for receiving an input signal from a cable head end section (105). The output gain stage section (215) includes multiple active amplifier circuits (225, 230) for amplifying the input signal to generate main and auxiliary outputs that are processed by a radio frequency (RF) detector (255) having at least a first detector circuit (300) for processing the main output to generate a first voltage and a second detector circuit (305) for processing the auxiliary output to generate a second voltage. Further included in the distribution amplifier (210) is a status monitor (260) coupled to the RF detector (255) for converting the first and second outputs to first and second digital values and transmitting the first and second digital values. In this manner, an indication of a system or amplifier malfunction can be provided.
    Type: Grant
    Filed: February 10, 1998
    Date of Patent: July 18, 2000
    Assignee: Scientific-Atlanta, Inc.
    Inventors: Saleh R. Al-Araji, James F. Blair, Herman A. Kruse
  • Patent number: 5237138
    Abstract: Complexity and unreliability in a mounting structure for a switch (40) used to sense the position of another object is avoided in a switch and mounting structure that includes a switch body (46) with a movable switch plunger (48) extending from one end (50) of the body (46). The body (46) has an outwardly opening groove (52) and a mounting bracket (44) is adapted to be secured to a desired object (70). The mounting bracket (42) has a base section (98) for mounting purposes and two spaced legs (100,102) extending therefrom. A relatively large hole (76) is in one of the legs (102) and sized to receive the switch body (46) while a relatively small hole (78) is in the other of the legs (100) and sized to slidably receive the plunger (48). A resilient lock ring (44) is located in the groove (52) and in abutment with one of the legs (102) to hold the end (50) in firm abutment with the other of the legs (100) thereby securely mounting the switch body (46).
    Type: Grant
    Filed: August 24, 1992
    Date of Patent: August 17, 1993
    Assignee: Saint Switch Inc.
    Inventor: James F. Blair
  • Patent number: 4027142
    Abstract: Automated processing of bank checks encoded with alphanumeric characters on the face of each check by transporting said checks as a serial constant velocity train through a processor to a sorter while at a first station generating an item control number unique to each document and at a second station sensing each character in the encoded line to produce a string of data signals for each document. At a third station the control number and other data is imprinted on the back of each document in code form and the control number and other data is imprinted on the face of each document in human readable form.
    Type: Grant
    Filed: August 18, 1975
    Date of Patent: May 31, 1977
    Assignee: Recognition Equipment Incorporated
    Inventors: Robert E. Paup, James F. Blair
  • Patent number: 3988571
    Abstract: Automatic processing of a stream of financial documents involving members of a series of positive item control numbers sequentially encoded one per document in the stream with account-amount data machine read from each document and stored in reproducible form in the same order as the series of control numbers. Reentry of documents into the stream from a reject stack because of failure to read one or more characters in the account-amount field involves displaying in response to a call to storage in response to the control number for a rejected document characters preceding and following a character present but not read from a rejected document. An entry into storage of each character not read at positions corresponding to the character position on the document is manually produced. Rejected documents are then passed through an encoder to impress a bar code representative of said account-amount thereon under control of the corrected storage in response to the control number.
    Type: Grant
    Filed: May 30, 1974
    Date of Patent: October 26, 1976
    Assignee: Recognition Equipment Incorporated
    Inventors: James F. Blair, Patricia L. Korn, Leonard J. Nunley