Inventor
WESTFALL NORMAN R
US21 patents
⚠️ This page may combine multiple inventors who share the name “WESTFALL NORMAN R”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
CALDWELL MFG CO
19 patentsUS5353548AOct 11, 1994
Curl spring shoe based window balance system
CALDWELL MFG CO126 citations99
US5463793ANov 7, 1995
Sash shoe system for curl spring window balance
CALDWELL MFG CO100 citations96
US5530991AJul 2, 1996
Block and tackle window balance
CALDWELL MFG CO63 citations95
US5572828ANov 12, 1996
Pin lock for tilt sash lock shoe
CALDWELL MFG CO37 citations92
US5207025AMay 4, 1993
Automatic friction shoe
CALDWELL MFG CO21 citations92
US5189838AMar 2, 1993
Tilt sash lock shoe system
CALDWELL MFG CO48 citations92
US5152032AOct 6, 1992
Window sash balance with tension and torsion spring
CALDWELL MFG CO30 citations92
US5119592AJun 9, 1992
Balance system for laterally biased sash guides
CALDWELL MFG CO29 citations92
US4941285AJul 17, 1990
Lift-off shoe system for tilt window
CALDWELL MFG CO43 citations92
US4885871ADec 12, 1989
Audibly locking shoe system for take-out window
CALDWELL MFG CO29 citations91
US4799333AJan 24, 1989
Lock shoe system for take-out window
CALDWELL MFG CO30 citations91
US4779380AOct 25, 1988
Spring cover friction system for sash balance
CALDWELL MFG CO16 citations82
US5199219AApr 6, 1993
Window jamb liner
CALDWELL MFG CO20 citations81
US4837976AJun 13, 1989
Window balance spring cover friction system
CALDWELL MFG CO21 citations81
US5551189ASep 3, 1996
Hurricane window brace
CALDWELL MFG CO11 citations74
US5231795AAug 3, 1993
Lock shoe system for heavy sash
CALDWELL MFG CO19 citations74
US5159794ANov 3, 1992
Jamb liner slot cover
CALDWELL MFG CO9 citations73
US4800680AJan 31, 1989
Cord guide system for sash balance
CALDWELL MFG CO18 citations71
US4811455AMar 14, 1989
Window spring anchor
CALDWELL MFG CO6 citations54