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Coupling ring for ventilation ducts |
| D454949 |
Coupling ring for ventilation ducts
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| Patent Drawings: | |
| Inventor: |
Mattsson, et al. |
| Date Issued: |
March 26, 2002 |
| Application: |
D/135,759 |
| Filed: |
January 17, 2001 |
| Inventors: |
Hogman; Sten (Grevie, SE)
Lennartsson; Kenneth (Torekov, SE)
Mattsson; Lars-Ake (B.ang.stad, SE)
Sonden; Carl-Gustaf (Angelholm, SE)
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| Assignee: |
Lindab AB (Bastad, SE) |
| Primary Examiner: |
Siegel; Mitchell |
| Assistant Examiner: |
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| Attorney Or Agent: |
Weingarten, Schurgin, Gagnebin & Lebovici LLP |
| U.S. Class: |
D23/393 |
| Field Of Search: |
D23/393; 28/890.15; 72/82; 72/83; 72/84; 72/86; 285/363 |
| International Class: |
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| 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.. |
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| Abstract: |
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| 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 three-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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