Inventor
DIETRICH HAGEN
CA15 patents
⚠️ This page may combine multiple inventors who share the name “DIETRICH HAGEN”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NORRIS INDUSTRIES
8 patentsUS4333324AJun 8, 1982
Spring/dead bolt lock assembly
NORRIS INDUSTRIES78 citations95
US4255953AMar 17, 1981
Combination spring/dead bolt lock
NORRIS INDUSTRIES35 citations91
US4108482AAug 22, 1978
Disengaging spindle locking mechanism
NORRIS INDUSTRIES51 citations90
US4254648AMar 10, 1981
Inner locking cylinder with captive key
NORRIS INDUSTRIES23 citations81
US4169618AOct 2, 1979
Plastic door lock
NORRIS INDUSTRIES24 citations79
US4109948AAug 29, 1978
Plastic latch bolt for door lock
NORRIS INDUSTRIES21 citations79
US4062579ADec 13, 1977
Knob attachment for door latch
NORRIS INDUSTRIES11 citations71
US4109498AAug 29, 1978
Fire sleeve for tubular locks
NORRIS INDUSTRIES6 citations62
MASCO BUILDING PRODUCTS CORP
5 patentsUS4974884ADec 4, 1990
Selective self-locking deadbolt latch
MASCO BUILDING PRODUCTS CORP25 citations92
US4921290AMay 1, 1990
Backset adjustable door latch
MASCO BUILDING PRODUCTS CORP25 citations92
US4892341AJan 9, 1990
Self-adjusting door strike
MASCO BUILDING PRODUCTS CORP29 citations92
US4813724AMar 21, 1989
Self-adjusting door strike
MASCO BUILDING PRODUCTS CORP26 citations92
US4893854AJan 16, 1990
Self-adjusting door strike
MASCO BUILDING PRODUCTS CORP22 citations81