| |
 |
Enterprise Construction Services, Inc. Patents |
|
Assignee: Enterprise Construction Services, Inc.
Address: Grand Rapids, MI
No. of patents: 1
Patents:
| Patent Number |
Title Of Patent |
Date Issued |
| 4288111 |
Joint construction for sheet metal ducts |
September 8, 1981 |
| A first section of cylindrical sheet metal duct has a end roll-formed to define an outwardly formed flange, a central cylindrical flange whose axis is parallel to the cylindrical wall of the duct and which is radially outwardly offset from the cylindrical wall, and an inwardly formed end |
|
|
|
