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| Number | Title | Issue Date |
| 4800680 | Cord guide system for sash balance A block and tackle balance system (10), contained within a spring cover (12) extending for the full length of a jamb liner (11), includes a guide (30) that directs a cord (25) through an angled course as it passes from the balance (20), through a hole (13... | 01/31/1989 |
| 4724577 | Spring force compensator for sash balances The invention is a force compensation device for use in a spring balanced sash holder for a jamb liner extruded from a durable resin such as polyvinyl chloride, and having a vertical track for containing the sash. Within the vertical track in the sash plo... | 02/16/1988 |
| 4697304 | Friction controlled window balance This invention relates to a window sash balance of the coil spring and cord type in which a friction drag element is in frictional contact with multiple lengths of loops of said cord.... | 10/06/1987 |
