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Coupling ring for ventilation ducts
D456072 Coupling ring for ventilation ducts

Patent Drawings:
Inventor: Mattsson, et al.
Date Issued: April 23, 2002
Application: D/135,789
Filed: January 17, 2001
Inventors: Hogman; Sten (Grevie, SE)
Lennartsson; Kenneth (Torekov, SE)
Mattsson; Lars-Ake (B.ang.stad, SE)
Sonden; Carl-Gustaf (.ANG.ngelholm, SE)
Assignee: Lindab AB (Bastad, SE)
Primary Examiner: Siegel; Mitchell
Assistant Examiner:
Attorney Or Agent: Weingarten, Schurgin, Gagnebin & Lebovici LLP
U.S. Class: D23/393
Field Of Search: D23/393; 29/890.15; 72/82; 72/83; 72/84; 72/86; 285/363
International Class:
U.S Patent Documents: D231356; 5129690; 5983496
Foreign Patent Documents: 2 311 031
Other References: 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--2.sup.nd ed., SMAGNA Section 1.8 ff., pp. 1.12-1.43..

Abstract:
Claim: The ornamental design for a coupling ring for ventilation ducts, as shown.
Description: FIG. 1 is a front perspective view of an oval coupling ring of the new design.

FIG. 2 is a rear perspective view of the coupling ring of the new design with a rear double-lip element.

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 a central straight portion of the same, showing said rear element, section line VII--VII in FIG. 5.

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