Inventor
DAVIDSON DONALD R
US25 patents
⚠️ This page may combine multiple inventors who share the name “DAVIDSON DONALD R”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
H TECH INC
8 patentsUS5993753ANov 30, 1999
Chlorinator/sanitizer and method of using same
H TECH INC66 citations96
US5591329AJan 7, 1997
Fluid filter with pleated septum
H TECH INC56 citations96
US7318448B2Jan 15, 2008
Swimming pool cleaning apparatus and parts therefor
H TECH INC47 citations92
US6254788B1Jul 3, 2001
Method of sanitizing water in a bathing pool
H TECH INC37 citations92
US6004458ADec 21, 1999
Filter/sanitizer
H TECH INC42 citations92
US5871641AFeb 16, 1999
Fluid filter with pleated septum
H TECH INC51 citations92
US5607224AMar 4, 1997
Plastic niche and grounding assembly therefor
H TECH INC39 citations91
US5432688AJul 11, 1995
Plastic niche and grounding assembly therefor
H TECH INC40 citations91
SINGER CO
8 patentsUS4296698AOct 27, 1981
Button attaching hand tool with button storage compartment
SINGER CO30 citations92
US4386573AJun 7, 1983
Embroidery attachment for electronic sewing machine
SINGER CO21 citations82
US4316562AFeb 23, 1982
Button attaching tool
SINGER CO23 citations82
US4434729AMar 6, 1984
Continuous monogrammer
SINGER CO12 citations74
US4380961AApr 26, 1983
Variably controllable bobbin thread pull-off mechanism
SINGER CO7 citations74
US4176561ADec 4, 1979
Low tolerance rotary to linear transmission
SINGER CO6 citations63
US4372237AFeb 8, 1983
Two dimensional feed for monogram sewing machine
SINGER CO5 citations61
US4167912ASep 18, 1979
Sewing machine stitch length override and feed balance for digital feed actuators
SINGER CO6 citations55
SSMC INC
7 patentsUSD312905SDec 11, 1990
Steam iron sole plate for high nap fabrics or similar article
SSMC INC9 citations72
US4955152ASep 11, 1990
Steam ironing press
SSMC INC10 citations71
US4953300ASep 4, 1990
Steam ironing press
SSMC INC7 citations71
US4922637AMay 8, 1990
Steam ironing press #1
SSMC INC6 citations60
USD313097SDec 18, 1990
Steam iron sole plate for seam opening or similar article
SSMC INC0 citations50
USD312907SDec 11, 1990
Steam iron sole plate for accommodating zippers or similar article
SSMC INC1 citations50
USD312906SDec 11, 1990
Steam iron sole plate for accommodating buttons and pleats or similar article
SSMC INC1 citations50