TREA

Coupling ring for ventilation ducts

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Information

  • Patent Grant
  • D475781
  • Patent Number
    D475,781
  • Date Filed
    Thursday, December 13, 2001
    23 years ago
  • Date Issued
    Tuesday, June 10, 2003
    22 years ago
Information
Abstract
Description




FIG. 1 is a front perspective view of an oval coupling ring according to a first embodiment of the new design with a front element.




FIG. 2 is a rear perspective view of the coupling ring of the new design.




FIG. 3 is a rear view of the coupling ring.




FIG. 4 is a side view of the coupling ring.




FIG. 5 is a front view of the coupling ring.




FIG. 6 is an end view of the coupling ring; and,




FIG. 7 is a cross-section of the coupling ring at the central straight portion of the same, showing said front element, section line VII—VII in FIG. 5.



Claims
  • The ornamental design for a coupling ring for ventilation ducts, as shown.
US Referenced Citations (3)
Number Name Date Kind
D231356 Kurr Apr 1974 S
5129690 Meinig et al. Jul 1992 A
5983496 Hermanson Nov 1999 A
Non-Patent Literature Citations (4)
Entry
AccuFlange: Round & Oval Duct Connection System, Accu Duct Mfg., product brochure, 1998, pp. 1-32.
LindabRekt, Instruction manual, Lindab Nord AB, May 20, 1998, pp. 1-4.
Rektangulara kanalsystem, Lindab Rekt, product brochure 2000, pp. 1-8.
Introduction to the Rectangular Duct Construction Schedules, HVAC Duct Construction Standards Metal and Flexible—2nd ed., SMAGNA Section 1.8 ff., pp. 1.12-1.43.