Inventor

David E. Pearce

Inventor

Houston, TX, US

Overview

8→

Patents

1990–2000

Patent span

Fixed constructions

Primary field (CPC E)

Patents· 8 as inventor

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

E21Bprimary

E21BEarth or rock drilling67%

E05YIndexing scheme associated with subclasses e05d and e05f, relating to construction elements, electric control, power supply, power signal or transmission, user interfaces, mounting or coupling, details, accessories, auxiliary operations not otherwise provided for, application thereof8%

F16CShafts8%

F16JPistons8%

Y10TTechnical subjects covered by former us classification8%

PatentTitleYear

6,109,376'Face seal having strain induced face geometry'2000 5,875,861'Different stiffness energizers for MF seals'1999 5,676,214'Flow channels for tooth type rolling cutter drill bits'1997 5,465,800'Rolling cutter drill bits'1995 5,096,005'Hydraulic action for rotary drill bits'1992 5,029,656'Nozzle means for rotary drill bits'1991 4,991,671'Means for mounting a roller cutter on a drill bit'1991 4,911,255'Means for retaining roller cutters on rotary drill bit'1990

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1990Patents assigned to REED TOOL CO (1)· patent assignee history

1990–2000Based in Houston, TX, US· patent location history

1991–2000Patents assigned to CAMCO INT (7)· patent assignee history

1995–1999Based in Spring, TX, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
CAMCO INT	7	1991–2000
REED TOOL CO	1	1990

Locations

Location	Patents	Span
Houston, Texas, US	5	1990–2000
Spring, Texas, US	3	1995–1999