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The ornamental design for a coupling ring for ventilation ducts, as shown.
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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.
Lennartsson, Kenneth, Mattsson, Lars-Åke, Högman, Sten, Sondén, Carl-Gustaf
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Jan 17 2001 | Lindab AB | (assignment on the face of the patent) | / | |||
| Jan 17 2001 | MATTSSON, LARS-AKE | Lindab AB | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 011489 | /0541 | |
| Jan 17 2001 | LENNARTSSON, KENNETH | Lindab AB | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 011489 | /0541 | |
| Jan 17 2001 | HOGMAN, STEN | Lindab AB | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 011489 | /0541 | |
| Jan 17 2001 | SONDEN, CARL-GUSTAF | Lindab AB | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 011489 | /0541 |
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