Inventor
KOIWA YASUAKI
JP36 patents
⚠️ This page may combine multiple inventors who share the name “KOIWA YASUAKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SENJU SPRINKLER CO LTD
28 patentsUS9320929B2Apr 26, 2016
Protective cap of sprinkler head and sprinkler head
SENJU SPRINKLER CO LTD25 citations94
USD721419SJan 20, 2015
Sprinkler head protective cap
SENJU SPRINKLER CO LTD18 citations92
USD603479SNov 3, 2009
Sprinkler head
SENJU SPRINKLER CO LTD19 citations92
USD1000585SOct 3, 2023
Protective cap for sprinkler head
SENJU SPRINKLER CO LTD7 citations86
USD895416SSep 8, 2020
Spring for sprinkler head
SENJU SPRINKLER CO LTD9 citations84
USD799924SOct 17, 2017
Wrench for sprinkler head
SENJU SPRINKLER CO LTD15 citations84
USD781399SMar 14, 2017
Sprinkler head body
SENJU SPRINKLER CO LTD16 citations84
US9463343B2Oct 11, 2016
Protecting cap and sprinkler head
SENJU SPRINKLER CO LTD19 citations84
USD721418SJan 20, 2015
Sprinkler head protective cap
SENJU SPRINKLER CO LTD11 citations84
USD673825SJan 8, 2013
Sprinkler cover plate assembly installation tool
SENJU SPRINKLER CO LTD6 citations84
USD638913SMay 31, 2011
Sprinkler head body
SENJU SPRINKLER CO LTD8 citations84
US7543654B2Jun 9, 2009
Sprinkler head cover and a sprinkler head
SENJU SPRINKLER CO LTD17 citations84
USD1083030SJul 8, 2025
Deflector for sprinkler head
SENJU SPRINKLER CO LTD3 citations75
USD598068SAug 11, 2009
Heat collector assembly for sprinkler head
SENJU SPRINKLER CO LTD6 citations74
USD961727SAug 23, 2022
Sprinkler head accessory
SENJU SPRINKLER CO LTD5 citations73
US11324980B2May 10, 2022
Sprinkler head
SENJU SPRINKLER CO LTD3 citations73
US11160999B2Nov 2, 2021
Protector for heat-sensitive element of sprinkler head
SENJU SPRINKLER CO LTD6 citations73
USD887800SJun 23, 2020
Spanner wrench
SENJU SPRINKLER CO LTD2 citations71
USD673826SJan 8, 2013
Sprinkler protective cap removal tool
SENJU SPRINKLER CO LTD3 citations63
USD1091762SSep 2, 2025
Deflector for sprinkler head
SENJU SPRINKLER CO LTD0 citations62
USD1029599SJun 4, 2024
Wrench socket for sprinkler head
SENJU SPRINKLER CO LTD0 citations62
US11511144B2Nov 29, 2022
Sprinkler head
SENJU SPRINKLER CO LTD1 citations62
USD964517SSep 20, 2022
Sprinkler head accessory
SENJU SPRINKLER CO LTD0 citations62
USD963110SSep 6, 2022
Sprinkler head accessory
SENJU SPRINKLER CO LTD1 citations62
USD892269SAug 4, 2020
Protector for sprinkler head
SENJU SPRINKLER CO LTD1 citations62
USD887527SJun 16, 2020
Wrench socket for sprinkler head
SENJU SPRINKLER CO LTD1 citations60
US11642557B2May 9, 2023
Sprinkler head accessory
SENJU SPRINKLER CO LTD0 citations52
US11383114B2Jul 12, 2022
Sprinkler head
SENJU SPRINKLER CO LTD0 citations52
KOIWA YASUAKI
5 patentsUS9630039B2Apr 25, 2017
Sprinkler head
KOIWA YASUAKI26 citations93
US9339675B2May 17, 2016
Sprinkler head
KOIWA YASUAKI21 citations92
USD683425SMay 28, 2013
Sprinkler protective cap
KOIWA YASUAKI12 citations83
USD663009SJul 3, 2012
Sprinkler cover plate assembly
KOIWA YASUAKI14 citations83
USD683426SMay 28, 2013
Sprinkler cover plate assembly
KOIWA YASUAKI3 citations62