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Inventor

Charles Armstrong

Inventor
Cincinnati, OH, US

Overview

3→
Patents
1986–1994
Patent span
Fixed constructions
Primary field (CPC E)

Patents· 3 as inventor

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

A61Bprimary
A61BDiagnosis25%
E21BEarth or rock drilling25%
E21CMining or quarrying25%
Y10TTechnical subjects covered by former us classification25%
PatentTitleYear
5,330,502'Rotational endoscopic mechanism with jointed drive mechanism'19945,114,213'High pressure water assisted mining and tunnelling machine'19924,593,769'Rotary rock drilling chuck'1986

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1986Patents assigned to BOART INT LTD (1)· patent assignee history
1986Based in Randburg, ZA· patent location history
1992Patents assigned to SASOL MINING PROPRIETARY LIMIT (1)· patent assignee history
1992Based in Johannesburg, ZA· patent location history
1994Patents assigned to ETHICON INC (1)· patent assignee history
1994Based in Cincinnati, OH, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
BOART INT LTD11986
ETHICON INC11994
SASOL MINING PROPRIETARY LIMIT11992
Locations
LocationPatentsSpan
Cincinnati, OH, US11994
Johannesburg, ZA11992
Randburg, ZA11986