1
Jonathan N Chasman, Ramon F Hegel, Philip E Kendall, Nathan B Postma, Douglas S Spencer: Coated abrasive suitable for use as a lapping material. Minnesota Mining and Manufacturing Company, Donald M Sell, David L Weinstein, September 27, 1988: US04773920 (109 worldwide citation)

Coated abrasive comprising a backing and abrasive grain adhered to said backing by means of a binder. The binder is prepared from a composition that is curable by free-radical polymerization. The composition contains abrasive grain suspended therein at the time the composition is coated onto the bac ...


2
Nathan B Postma: Automatic belay warning system. NICROS, Westman Champlin & Kelly P A, Z Peter Sawicki, April 2, 2013: US08408360 (6 worldwide citation)

A warning system for use with a climbing wall and an automatic belay apparatus for belaying a climber, the warning system providing a warning that a climber is not protected by the auto-belay apparatus. The warning system includes a sensor positioned to sense that a lower end of the climbing rope is ...


3
Nathan B Postma, Kevin E Cieszkowski: Wall-climbing accessory. Nicros, Moore & Hansen PLLP, April 28, 2009: US07524269 (6 worldwide citation)

A wall-climbing accessory adapted for mounting onto a wall structure is described. The wall-climbing accessory comprises a resilient body that is flexible. The resilient body comprises an exterior surface and an edge. The exterior surface is configured to provide an engagement point capable of suppo ...


4
Nathan B Postma: Climbing wall structure and method of construction. Nicros, Moore & Hansen PLLP, August 11, 2009: US07572207 (5 worldwide citation)

A climbing wall structure comprising of a primary frame and a plurality of wall panels is described. Each wall panel has a periphery adapted for abutment with an adjacent wall panel. Each wall panel is connected to adjacent panels with a mounting bracket, such that the wall panels form an integral e ...


5
Nathan B Postma: Climbing wall structure and method of construction. NICROS, Moore Hansen & Sumner Pllp, November 16, 2006: US20060258511-A1

A climbing wall structure comprising of a primary frame and a plurality of wall panels is described. Each wall panel has a periphery adapted for abutment with an adjacent wall panel. Each wall panel is connected to adjacent panels with a mounting bracket, such that the wall panels form an integral e ...


6
Nathan B Postma: Automatic belay warning system. NICROS, Westman Champlin & Kelly Pa, August 7, 2008: US20080185221-A1

A warning system for use with a climbing wall and an automatic belay apparatus for belaying a climber, the warning system providing a warning that a climber is not protected by the auto-belay apparatus. The warning system includes a sensor positioned to sense that a lower end of the climbing rope is ...


7
Nathan B Postma, Kevin E Cieszkowski: Wall-climbing accessory. Nicros, Moore Hansen & Sumner Pllp, June 1, 2006: US20060116244-A1

A wall-climbing accessory adapted for mounting onto a wall structure is described. The wall-climbing accessory comprises a resilient body that is flexible. The resilient body comprises an exterior surface and an edge. The exterior surface is configured to provide an engagement point capable of suppo ...