John A. Helmsderfer — 54 Patents at Unknown

John A. Helmsderfer has been granted 54 US patents while listed as an inventor at Unknown. The first was granted in 1994 and the most recent in September 2020. John A. Helmsderfer ranks #46,969 of 4,157,543 US inventors in our database (top 1.1%). Patent records list John A. Helmsderfer in East Liverpool, OH, US.

Issued Patents All Time

Showing 1–25 of 54 patents

Patent #	Title	Co-Inventors	Date
10757872	Multi-functional and modular tree removal and maintenance apparatus and related methods	Stuart McDowell, Florin Ababei, Alex Androski	2020-09-01
10525487	Garden watering device	Nathan Maggard, Andrew Ahr, Nicholas Jeffers, Yani Deros, Craig Ovans	2020-01-07
D827090	Lawn and garden sprinkler	—	2018-08-28
D825716	Sprinkler with fold-out legs	Nathan Maggard	2018-08-14
9724708	Garden watering device	Nathan Maggard, Andrew Ahr, Nicholas Jeffers, Yani Deros, Craig Ovans	2017-08-08
9597699	Water flow metering device	Andrew Ahr	2017-03-21
8910887	Garden watering device	Nicholas Jeffers	2014-12-16
8739843	Multi-functional and modular tree removal and maintenance apparatus and related methods	Stuart McDowell, Florin Ababei, Alex Androski	2014-06-03
7426765	Baby diaper changing station	—	2008-09-23
7426761	Patient immobilization device	Brian Tomcany	2008-09-23
7260859	Baby diaper changing station	—	2007-08-28
7165278	Patient immobilization device	Brian Tomcany	2007-01-23
7036167	Patient immobilization device	Brian Tomcany	2006-05-02
6859966	Baby diaper changing station	—	2005-03-01
6619734	Child support device with displaceable seat element	—	2003-09-16
6224148	Child support device with removable seat element	Greg Lee	2001-05-01
6203102	Child support device with slidable seat element	Greg Lee	2001-03-20
D435893	Undersink shield	—	2001-01-02
D431288	Undersink shield	—	2000-09-26
6074007	Child support device with slidable seat element	Greg Lee	2000-06-13
6055688	Baby diaper changing station with hidden hinge structure	David Memke	2000-05-02
6049928	Baby diaper changing station	—	2000-04-18
6032310	Baby diaper changing station with integral flange structure	David Memke	2000-03-07
6028627	Camera system for capturing a sporting activity from the perspective of the participant	—	2000-02-22
6012480	Cover assembly for covering undersink piping utilizing sliding cover pieces	—	2000-01-11

12 3 Next »

John A. Helmsderfer — 54 Patents

Issued Patents All Time

Patent Widget