Inventor
Robert F. Crane
Inventor
Oconomowoc, WI, US
Overview
Patents· 63 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
E21Bprimary
E21BEarth or rock drilling48%
F16LPipes25%
Y10TTechnical subjects covered by former us classification14%
B23DPlaning2%
E02FDredging2%
E03FSewers2%
E21CMining or quarrying2%
F16BDevices for fastening or securing constructional elements or machine parts together, e.g. nails, bolts, circlips, clamps, clips or wedges2%
B66DCapstans1%
E05CBolts or fastening devices for wings, specially for doors or windows1%
PatentTitleYear
11,112,033Pipe extraction assisted by pre-stressed strand202110,969,053Lead pipe spudding prior to extraction or remediation202110,927,602Reversible pneumatic pipe ramming tool202110,883,628Extraction of ductile pipe202110,584,807Extraction of ductile pipe202010,550,989Latch assembly for use with an inversion drum202010,415,722Split ring ram adapter with cam adjustment201910,246,949Slip style rod spinner for pipe bursting machine201910,161,201Powered slip actuation2018D0816456Gut hook bladed pipe slitter20189,915,109'Slip style rod spinner for pipe bursting machine'20189,611,696'Directional drill hammer pullback device'20179,566,653'Pipe slitter'20179,512,951'Pipe slitting apparatus'20169,328,760'Quick connect rods'20169,169,946'Directional drill hammer pullback device'20158,979,435'Rod pulling and pushing machine for pipe bursting'20158,955,586'Beacon assembly'20158,887,833'Reamer assembly'20148,844,655'Drill string tooling joint'20148,789,891'Method and apparatus for creating a planar cavern'20148,646,846'Method and apparatus for creating a planar cavern'20148,225,885'Joint for use in back reaming'20128,157,478'Rod pushing and pulling machine'20127,993,078'Method and apparatus for installing an underground pipe'20117,909,539'Rod pulling and pushing machine for pipe bursting'20117,559,722'Method and apparatus for pipe reforming and clearing'20097,255,516'Method and apparatus for replacement of underground pipe'20077,140,806'Rod pulling and pushing machine for pipe bursting'20067,086,808'Method and apparatus for on-grade boring'20066,913,091'Method and apparatus for replacement of underground pipe'20056,860,514'Drill string joint'20056,789,635'Drill bit for directional drilling in cobble formations'20046,755,593'Pipe replacement method and rotary impact mechanism for pipe bursting'20046,655,874'Method and apparatus for slitting flexible pipe in an underground bore'20036,588,515'Drill bit for directional drilling'20036,568,488'Roller pipe burster'20036,533,052'Drill bit for impact-assisted directional boring'20036,516,899'Method and apparatus for directional boring under mixed conditions'20036,470,979'Sonde housing structure'20026,450,269'Method and bit for directional horizontal boring'20026,439,319'Method and apparatus for directional boring under mixed conditions'20026,390,087'Drill bit for directional drilling'20026,390,207'Method and apparatus for directional boring under mixed conditions'20026,371,223'Drill head for directional boring'20026,321,858'Bit for directional drilling'20016,302,410'Rod gripping jaw'20016,283,229'Impact device for directional boring'20016,273,201'Pneumatic ground piercing tool with movable chisel head'20016,263,983'Apparatus for directional drilling'20016,261,027'Portable pulling apparatus'20016,260,634'Sonde housing for directional drilling'20016,171,026'Method and apparatus for replacement of pipelines'20016,148,935'Joint for use in a directional boring apparatus'20005,687,803'Method for reversing a ground piercing tool'19975,651,639'Method and apparatus for installation of underground pipe'19975,603,383'Reversible pneumatic ground piercing tool'19975,487,430'Pneumatic ground-piercing tool and body therefor'19965,465,797'Pneumatic ground piercing tool with detachable head'19955,440,797'Method for making a pneumatic ground piercing tool'19955,337,837'Dual-diameter pneumatic ground piercing tool'19945,199,151'Method for making a pneumatic ground piercing tool'19935,025,868'Pneumatic ground piercing tool'1991Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1991–1997Patents assigned to EARTH TOOL CORP (7)· patent assignee history
1991–1996Based in Mequon, WI, US· patent location history
1995–2018Based in Oconomowoc, WI, US· patent location history
1997–2021Patents assigned to EARTH TOOL CO LLC (50)· patent assignee history
2001Based in Oconomononoc, WI, US· patent location history
2004Based in Oconomowod, WI, US· patent location history
2012–2015Patents assigned to CRANE ROBERT F (8)· patent assignee history
2012–2015Patents assigned to WENTWORTH STEVEN W (6)· patent assignee history
2018–2021Based in Nekoosa, WI, US· patent location history
2020–2021Patents assigned to CHARLES MACHINE WORKS (5)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| EARTH TOOL CO LLC | 50 | 1997–2021 |
| CRANE ROBERT Fself | 8 | 2012–2015 |
| EARTH TOOL CORP | 7 | 1991–1997 |
| WENTWORTH STEVEN W | 6 | 2012–2015 |
| CHARLES MACHINE WORKS | 5 | 2020–2021 |
Locations
| Location | Patents | Span |
|---|---|---|
| Oconomowoc, WI, US | 45 | 1995–2018 |
| Nekoosa, WI, US | 10 | 2018–2021 |
| Mequon, WI, US | 4 | 1991–1996 |
| Oconomowod, WI, US | 1 | 2004 |
| Oconomononoc, WI, US | 1 | 2001 |