Inventor
David U. Hillstrom
Inventor
Novi, MI, US
Overview
Patents· 61 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G09Fprimary
G09FDisplaying38%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests12%
Y10TTechnical subjects covered by former us classification10%
E01FAdditional work, such as equipping roads or the construction of platforms, helicopter landing stages, signs, snow fences, or the like9%
F21SNon-portable lighting devices6%
F21VFunctional features or details of lighting devices or systems thereof6%
F21WIndexing scheme associated with subclasses f21k, f21l, f21s and f21v, relating to uses or applications of lighting devices or systems6%
A47GHousehold or table equipment3%
B65HHandling thin or filamentary material, e.g. sheets, webs, cables3%
E04FFinishing work on buildings, e.g. stairs, floors2%
PatentTitleYear
8,104,205'Sign stand with rolling base'20127,996,980'Sign stand with rolling base'20117,941,951'Sign stand with rolling base'20117,698,843'Flexible sign mount'20107,584,563'Sign stand with rolling base'20097,458,554'Portable sign stand with sign release mechanism'20087,174,663'Outdoor menu display device'20076,843,011'Menu display device'20056,755,381'Portable sign stand with leg release mechanism'20046,631,576'Outdoor menu display device'20036,606,809'Fold-up sign panel assembly'20036,560,906'Portable sign stand having frangible post'20036,427,964'Flag holder bracket for sign stand'20026,298,589'Outdoor menu display device'20016,237,883'Sign bracket for sign stand'20016,125,565'Outdoor menu display device'20006,056,250'Sign stand for flexible traffic control signage'20006,032,908'Sign stand with cam release assembly'20005,983,543'Outdoor menu display device'19995,947,589'Illuminated lightbox structure with light dispersion members'19995,931,564'Illuminated canopy system'19995,878,474'Method for installing flexible sign panels with movable trolley'1999RE036039'Illuminated canopy system'19995,829,178'Portable collapsible sign and stand'19985,815,971'Poster frame with moisture seal'19985,746,503'Illuminated canopy system'19985,738,294'Movable apparatus for installing flexible sign panels'1998D0392686'Sign stand with rolling base'19985,725,186'Universal flexible sign mounting device'19985,725,173'Movable apparatus for installing flexible sign panels'19985,713,659'Illuminated canopy with access doors'19985,685,054'Method for installing flexible sign panels with movable device'19975,682,694'Outdoor menu display device'19975,675,923'Rigid sign with protective changeable indicia member'19975,647,155'Sheet tensioning system'19975,613,763'Method for installing illuminated canopy system'19975,537,302'Illuminated sign with patterned openings on light dispersion member'19965,442,871'Poster and sign display assembly'1995D0360078'Wall mounted sign frame'19955,428,913'Pole banner system'19955,381,324'Illuminated canopy system'1995D0351863'Free standing sign stand'19945,142,804'Releasable anchoring and tensioning apparatus for billboard displays'19925,040,586'Banner holding device'19914,958,458'Poster display device with longitudinal retention of frame sections by inserts'19904,937,959'Poster display device with longitudinal retention of frame sections'19904,862,615'Releasable anchoring and tensioning apparatus for billboard displays'19894,823,533'Structural cladding apparatus'19894,782,610'Display assembly with illumination system'19884,756,107'Display retention and tensioning frame'19884,730,803'Ground access elevated pole banner'19884,714,220'Sign stand assembly'19874,691,892'Sign and sign stand'19874,648,169'Method of mounting universal mounting bracket for gas pump toppers'19874,592,530'Universal mounting bracket for gas pump toppers'1986D0276445'Illuminated sign with clock'19844,433,935'Sign bracket'19844,145,828'Poster display device'19794,138,787'Display holder'19794,040,223'Panel framing device and method'19774,033,536'Mounting bracket coil spring'1977Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1977–2012Patents assigned to MARKETING DISPLAYS INC (52)· patent assignee history
1977–1979Patents assigned to SARKISIAN ROBERT (2)· patent assignee history
1977–2012Based in Novi, MI, US· patent location history
1987Patents assigned to GOODRICH CO B F (1)· patent assignee history
1998Based in Gilber, MI, US· patent location history
2000Patents assigned to MARKETING DISPLAYS INTERNATION (2)· patent assignee history
2001–2002Patents assigned to MARKETING DISPLAYS INTERNAT (2)· patent assignee history
2010Based in Hancock, MI, US· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| MARKETING DISPLAYS INC | 52 | 1977–2012 |
| MARKETING DISPLAYS INTERNAT | 2 | 2001–2002 |
| MARKETING DISPLAYS INTERNATION | 2 | 2000 |
| SARKISIAN ROBERT | 2 | 1977–1979 |
| GOODRICH CO B F | 1 | 1987 |
Locations
| Location | Patents | Span |
|---|---|---|
| Novi, MI, US | 59 | 1977–2012 |
| Hancock, MI, US | 1 | 2010 |
| Gilber, MI, US | 1 | 1998 |