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Inventor

Douglas L. Hoffman

Inventor
Spokane, WA, US

Overview

5→
Patents
1976–2010
Patent span
Performing operations
Primary field (CPC B)

Patents· 5 as inventor

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

B02Cprimary
B02CCrushing, pulverising, or disintegrating in general29%
B24BMachines, devices, or processes for grinding or polishing29%
Y10TTechnical subjects covered by former us classification29%
B41JTypewriters14%
PatentTitleYear
7,802,859'Refilling a used ink cartridge'20104,265,057'Collet chuck aligning assembly for gem faceting machines'19814,082,234'Milling wheels for small flour mills'19784,039,153'Grinding mill'19773,992,821'Gem faceting machine having an adjustable faceting head support assembly'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976–1981Patents assigned to HOFFMAN DOUGLAS L (3)· patent assignee history
1976–1978Based in Spokane, WA, US· patent location history
1978Patents assigned to HOFFMAN DOUGLAS (1)· patent assignee history
1981Based in Clayton, WA, US· patent location history
2010Patents assigned to HEWLETT PACKARD DEVELOPMENT CO (1)· patent assignee history
2010Based in San Diego, CA, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
HOFFMAN DOUGLAS Lself31976–1981
HEWLETT PACKARD DEVELOPMENT CO12010
HOFFMAN DOUGLASself11978
Locations
LocationPatentsSpan
Spokane, Washington, US31976–1978
San Diego, California, US12010
Clayton, Washington, US11981