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United States Patent D456,071
Mattsson ,   et al. April 23, 2002

Coupling ring for ventilation ducts


The ornamental design for a coupling ring for ventilation ducts, as shown.
Inventors: Mattsson; Lars-.ANG.ke (B.ang.stad, SE), Lennartsson; Kenneth (Torekov, SE), Hogman; Sten (Grevie, SE), Sonden; Carl-Gustaf (Angelholm, SE)
Assignee: Lindab AB (Bastad, SE)
Appl. No.: D/135,758
Filed: January 17, 2001

Current U.S. Class: D23/393
Current International Class: 2304
Field of Search: D23/393 29/890.15 72/82-84,86 285/363

References Cited

U.S. Patent Documents
D231356 April 1974 Kurr
5129690 July 1992 Meinig et al.
5983496 November 1999 Hermanson
Foreign Patent Documents
2 311 031 Jun., 1998 GB

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..

Primary Examiner: Siegel; Mitchell
Attorney, Agent or Firm: Weingarten, Schurgin, Gagnebin & Lebovici LLP


FIG. 1 is a front perspective view of a circular 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, showing said rear element, section line VII--VII in FIG. 5.

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