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Inventor

Alfred Ostertag

Inventor
Celle, DE

Overview

17→
Patents
1976–2020
Patent span
Performing operations
Primary field (CPC B)

Patents· 17 as inventor

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

Y10Tprimary
Y10TTechnical subjects covered by former us classification23%
E21BEarth or rock drilling21%
B24BMachines, devices, or processes for grinding or polishing18%
B23PMetal-working not otherwise provided for13%
B23BTurning5%
C21DModifying the physical structure of ferrous metals5%
B05BSpraying apparatus3%
B21JForging3%
B23DPlaning3%
B23QDetails, components, or accessories for machine tools, e.g. arrangements for copying or controlling3%
PatentTitleYear
10,549,392Hammering device for influencing workpieces20209,616,546'Rolling tool'20179,321,135'Fluidostatic rolling device for surface processing and method for shaping the edge layer'20169,308,586'Paring tool, method for producing a cylinder unit and lathe'20169,120,198'Rolling body guide with a separately exchangeable rolling body as well as a receiving section and a rolling tool with an associated exchange method'20156,755,065'Method of and tool for rolling a workpiece, and arrangement of a rolling tool and a workpiece'20046,711,976'Skiving head and process for skiving cylinders and cylinder tubes'20044,947,668'Rolling milling tool'19904,922,739'Roller milling tool unit for a milling machine tool'19904,878,548'Nozzle retention system for a drill bit'19894,875,531'Core drilling tool with direct drive'19894,854,403'Stabilizer for deep well drilling tools'19894,497,383'Undercutting device for anchor holes'19854,194,582'Double acting shock absorbers for drill strings'19804,092,881'Apparatus for making-up and breaking threaded pipe connections'19783,945,446'Stabilizer for drill strings'19763,938,853'Shrink-fit sleeve apparatus for drill strings'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976Patents assigned to CHRISTENSEN DIAMOND PROD CO (2)· patent assignee history
1976–2020Based in Celle, DE· patent location history
1978–1980Patents assigned to CHRISTENSEN INC (2)· patent assignee history
1989Patents assigned to EASTMAN CHRISTENSEN CO (3)· patent assignee history
2004–2020Patents assigned to ECOROLL AG WERKZEUGTECHNIK (5)· patent assignee history
2015–2017Patents assigned to OSTERTAG ALFRED (4)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
ECOROLL AG WERKZEUGTECHNIK52004–2020
OSTERTAG ALFREDself42015–2017
EASTMAN CHRISTENSEN CO31989
CHRISTENSEN DIAMOND PROD CO21976
CHRISTENSEN INC21978–1980
Locations
LocationPatentsSpan
Celle, DE171976–2020