Inventor
Percy R. Helm
Inventor
Manitowoc, WI, US
Overview
Patents· 6 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
B66Cprimary
B66CCranes86%
Y10TTechnical subjects covered by former us classification14%
PatentTitleYear
4,953,722'Crane and lift enhancing beam attachment with moveable counterweight'19904,601,402'Steerable concentric ring segment supported lift crane'19864,449,635'Imaginary pivot lift crane'19844,358,021'Separated ring segment dual pivot lift crane'19824,316,548'Concentric ring segment supported lift crane'19823,977,530'Crane with gantry backhitch and boom hoist assembly removable as a unit'1976Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1976–1990Patents assigned to MANITOWOC CO (6)· patent assignee history
1976–1990Based in Manitowoc, WI, US· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| MANITOWOC CO | 6 | 1976–1990 |
Locations
| Location | Patents | Span |
|---|---|---|
| Manitowoc, WI, US | 6 | 1976–1990 |