Inventor
David L. Wortman
Inventor
St. Paul, MN, US
Overview
Patents· 26 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G02Bprimary
G02BOptical elements, systems or apparatus24%
G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein21%
B32BLayered products, i.e. products built-up of strata of flat or non-flat, e.g. cellular or honeycomb, form14%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests11%
Y10TTechnical subjects covered by former us classification7%
B29DProducing particular articles from plastics or from substances in a plastic state6%
B29CShaping or joining of plastics5%
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. inserts5%
A47JKitchen equipment4%
F21VFunctional features or details of lighting devices or systems thereof2%
PatentTitleYear
7,833,593'High efficiency optical devices'20107,423,708'Display having a reflective polarizer'20087,147,903'High efficiency optical devices'20067,038,745'Brightness enhancing reflective polarizer'20066,934,082'Optical devices using reflecting polarizing materials'20056,924,014'High efficiency optical devices'20056,905,220'Backlight system with multilayer optical film reflector'20056,888,675'Transflective displays with reflective polarizing transflector'20056,641,883'High efficiency optical devices'20036,543,153'Reflective polarizer having improved properties and optical display with improved reflective polarizer'20036,515,785'Optical devices using reflecting polarizing materials'20036,447,135'Lightguide having a directly secured reflector and method of making the same'20026,262,842'Transflective displays with reflective polarizing transflector'20016,210,785'High efficiency optical devices'20016,124,971'Transflective displays with reflective polarizing transflector'20006,101,032'Light fixture having a multilayer polymeric film'20006,091,547'Luminance control film'20006,080,467'High efficiency optical devices'20006,025,897'Display with reflective polarizer and randomizing cavity'20006,018,419'Diffuse reflectors'20005,828,488'Reflective polarizer display'19985,825,542'Diffusely reflecting multilayer polarizers and mirrors'19985,771,328'Light directing film having variable height structured surface and light directing article constructed therefrom'19985,363,470'Displacing an optical lighting film\'s linear array of grooves to facilitate emission of light'19945,202,683'Optical traffic preemption detector'19935,095,415'Light fixture for externally illuminated sign'1992Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1992–1998Patents assigned to MINNESOTA MINING & MFG (6)· patent assignee history
1992Based in St. Mary's Point, MN, US· patent location history
1993–2008Based in St. Paul, MN, US· patent location history
2000–2010Patents assigned to 3M INNOVATIVE PROPERTIES CO (18)· patent assignee history
2000Patents assigned to 3M INTELLECTUAL PROPERTIES COM (1)· patent assignee history
2002–2010Based in Stillwater, MN, US· patent location history
2005Patents assigned to 3MINNOVATIVE PROPERTIES COMPAN (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| 3M INNOVATIVE PROPERTIES CO | 18 | 2000–2010 |
| MINNESOTA MINING & MFG | 6 | 1992–1998 |
| 3M INTELLECTUAL PROPERTIES COM | 1 | 2000 |
| 3MINNOVATIVE PROPERTIES COMPAN | 1 | 2005 |
Locations
| Location | Patents | Span |
|---|---|---|
| St. Paul, Minnesota, US | 19 | 1993–2008 |
| Stillwater, Minnesota, US | 6 | 2002–2010 |
| St. Mary's Point, Minnesota, US | 1 | 1992 |