Inventor

Douglas S. Spencer

Inventor

St. Paul, MN, US

Overview

4→

Patents

1988–2001

Patent span

Performing operations

Primary field (CPC B)

Patents· 4 as inventor

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

B24Dprimary

B24DTools for grinding, buffing or sharpening27%

Y10TTechnical subjects covered by former us classification13%

A47LDomestic washing or cleaning7%

B05DProcesses for applying fluent materials to surfaces, in general7%

B29CShaping or joining of plastics7%

B29KIndexing scheme associated with subclasses b29b, b29c or b29d, relating to moulding materials or to materials for moulds, reinforcements, fillers or preformed parts, e.g. inserts7%

B29LIndexing scheme associated with subclass b29c, relating to particular articles7%

B65HHandling thin or filamentary material, e.g. sheets, webs, cables7%

C08GMacromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds7%

D04HMaking textile fabrics, e.g. from fibres or filamentary material7%

PatentTitleYear

6,207,246'Nonwoven abrasive material roll'2001 5,551,961'Abrasive articles and methods of making same'1996 5,368,618'Method of making a coated abrasive article'1994 4,773,920'Coated abrasive suitable for use as a lapping material'1988

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1988–1996Patents assigned to MINNESOTA MINING & MFG (3)· patent assignee history

1988–2001Based in St. Paul, MN, US· patent location history

1994Based in Ramsey, MN, US· patent location history

2001Patents assigned to 3M INNOVATIVE PROPERTIES CO (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
MINNESOTA MINING & MFG	3	1988–1996
3M INNOVATIVE PROPERTIES CO	1	2001

Locations

Location	Patents	Span
St. Paul, Minnesota, US	3	1988–2001
Ramsey, Minnesota, US	1	1994