1
Robert M Callahan, Bob C Liang: Interactive computer graphics display system processing method for identifying an operator selected displayed object. International Business Machines Corporation, Michael J Scheer, John D Crane, Mark S Walker, January 1, 1991: US04982345 (35 worldwide citation)

An interactive computer graphics display system processing method for identifying a displayed primitive that intersects an operator selected area of the display screen. Pursuant to the method, the operator selected area of the display screen is reverse mapped to world coordinate space; data represen ...


2
Robert M Callahan, Anthony M Fiore, Edward C Flickinger, Bruce C Hempel, Bruce E Whistance: Picking in a graphics system. International Business Machines Corporation, Mark S Walker, George E Clark, July 11, 1989: US04847605 (34 worldwide citation)

A method is described for improving the responsiveness and accuracy of a graphics system to user-initiated picking actions. In this method, the visual cueing and pick window positioning components of the graphics system tracking/picking function are temporarily separated at the time the user attempt ...


3
Robert M Callahan, Bruce C Hempel, Bob C Liang: Multistage clipping method. International Business Machines Corporation, William A Kinnaman Jr, Mark S Walker, George E Clark, April 30, 1991: US05012433 (31 worldwide citation)

A method for clipping two and three dimensional graphic primitives for use in a computer graphics workstation. During the first clipping stage, the system removes all graphic primitives which lie outside an arbitrary clipping volume or window that is an enlargement of the desired viewing volume or w ...


4
Robert M Callahan, Bruce C Hempel: Application exit for potentially pickable primitives in a graphics system. International Business Machines Corporation, William A Kinnaman Jr, Mark W Walker, J Dennis Moore, June 25, 1991: US05027291 (22 worldwide citation)

A method is described that gives local control to an application program during the drawing process when a "pickable" primitive intersects the pick window. This control is provided in such a way that the state of graphics workstation remains unaltered. Thus the application program is permitted to ma ...


5
Robert M Callahan, Ronald B Shiflett: Joist reinforcing bracket. Stephen R Greiner, May 28, 1996: US05519977 (18 worldwide citation)

A bracket for reinforcing a wooden joist provided with a hole for the passage of a utility conduit. The bracket includes a base wall having a central opening, sized to accommodate the utility conduit, for positioning against one side of the wooden joist. A pair of integral side walls extend at right ...


6
Robert M Callahan, Ronald B Shiflett: Composite beam. Stephen R Greiner, May 6, 1997: US05625997 (7 worldwide citation)

A composite beam including an elongated metal shell and a pierceable insert contained within at least one end of the elongated metal shell.


7
Robert M Callahan, Ronald B Shiflett: Composite beam. Stephen R Greiner, November 10, 1998: US05832691 (7 worldwide citation)

A composite beam including an elongated metallic shell and a pierceable insert contained within at least one end of the elongated metal shell. A bracket abutting the pierceable insert supports such within the elongated metallic shell. The bracket includes a pair of longitudinal plates for secure att ...


8
Robert M Callahan, Ronald B Shiflett: Internally reinforced girder with pierceable nonmetal components. Metwood, Stephen R Greiner, July 13, 1999: US05921053 (5 worldwide citation)

A girder including a pair of C-shaped members secured together so as to form a hollow box. A number of reinforcing rods are secured within the C-shaped members. The reinforcing rods extend the respective lengths of the C-shaped members and are positioned side-by-side. A pierceable block is secured t ...


9
Robert M Callahan: Joist reinforcing bracket. Stephen R Greiner, March 25, 2008: US07347031 (2 worldwide citation)

A bracket for reinforcing a wooden joist including a body having a central portion with a base wall. An upper portion is integrally formed with the central portion and has a first wall secured to and extending forwardly from the top of the base wall and a second wall secured to and extending from th ...


10
Robert M Callahan, Shawn A Callahan: Systems, devices, and/or methods for managing deck installation. Dale Jensen, Dale Jensen, August 28, 2018: US10060118

Certain exemplary embodiments can provide deck bracket, which comprises a bracket face. The bracket face is substantially planar and defines a first plane. The deck bracket comprises a first bracket wall and a second bracket wall, each of which directly contact the bracket face. The deck bracket com ...