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Inventor

Mitchell I. Kieffer

Inventor
Minneapolis, MN, US

Overview

17→
Patents
2004–2021
Patent span
Fixed constructions
Primary field (CPC E)

Patents· 17 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

E06Cprimary
E06CLadders52%
Y10TTechnical subjects covered by former us classification26%
LOC2522%
PatentTitleYear
10,995,547Telescoping ladder with a cascading collapse mechanism202110,753,149Extendable / retractable ladder202010,731,413Foldable ladder202010,233,692Foldable ladder201910,053,912Extendable / retractable ladder20189,580,959'Foldable ladder'2017D0767784'Hinge for a telescoping stepladder'20169,416,591'Telescoping ladder with stabilizers'2016D0684278'Collapsible five legged stepstool'20138,387,753'Ergonomic extendable/retractable ladder'2013D0665927'Metal and wood step ladder'20128,225,906'Extendable/retractable ladder'2012D0624200'Step ladder'2010D0593685'Telescoping ladder rung'20097,048,094'Extending ladder and associated manufacturing methods'20066,883,645'Extending ladder and associated manufacturing methods'20056,708,800'Extending ladder and associated manufacturing methods'2004

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

2004–2021Patents assigned to CORE DISTRIB INC (15)· patent assignee history
2004–2006Patents assigned to URBAN SPORTING GOODS (3)· patent assignee history
2004–2020Based in Minneapolis, MN, US· patent location history
2012–2013Patents assigned to KIEFFER MITCHELL I (4)· patent assignee history
2013Patents assigned to AIZMAN CRAIG S (1)· patent assignee history
2013Patents assigned to CALDWELL ALLEN (1)· patent assignee history
2018–2021Based in Key Biscayne, FL, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
CORE DISTRIB INC152004–2021
KIEFFER MITCHELL Iself42012–2013
URBAN SPORTING GOODS32004–2006
AIZMAN CRAIG S12013
CALDWELL ALLEN12013
Locations
LocationPatentsSpan
Minneapolis, Minnesota, US142004–2020
Key Biscayne, Florida, US32018–2021