Randall H. Helland — 12 Patents at 3M

Randall H. Helland has been granted 12 US patents while listed as an inventor at 3M. The first was granted in 1987 and the most recent in January 2007. Randall H. Helland ranks #396,045 of 4,157,543 US inventors in our database (top 9.5%). Patent records list Randall H. Helland in Richfield, MN, US.

Issued Patents All Time

Showing 1–12 of 12 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
7169831	Pavement marking composition comprising ceramic fibers	Eric E. Rice	2007-01-30	$10,108,000
6329128	Stable antihalation materials for photographic and photothermographic elements	Charles W. Gomez, William D. Ramsden	2001-12-11	$5,994,000
5395747	Stabilized thermal-dye-bleach constructions	William D. Ramsden, Roger A. Mader	1995-03-07	$6,109,000
5384237	Quaternary-ammonium phenylsulfonylacetate thermal-dye-bleach agents	Dian E. Stevenson, Mark P. Kirk, Sylvia A. Farnum, William C. Frank, Jonathan P. Kitchin +7 more	1995-01-24	$13,274,000
5380635	Dihydroperimidine squarylium dyes as antihalation and acutance materials for photographic and photothermographic articles	Charles W. Gomez, Lori S. Harring, William D. Ramsden, Tran Van Thien	1995-01-10	$4,240,000
5324627	Tetra-alkylammonium phenylsulfonylacetate thermal-dye-bleach agents	Dian E. Stevenson, Mark P. Kirk, Sylvia A. Farnum, William C. Frank, Jonathan P. Kitchin +7 more	1994-06-28	$7,659,000
5314795	Thermal-dye-bleach construction comprising a polymethine dye and a thermal carbanion-generating agent	Sylvia A. Farnum, Mark P. Kirk, Jonathan P. Kitchin, Roger A. Mader, Mark B. Mizen +6 more	1994-05-24	$6,450,000
5266452	Photographic element containing a thermal dye bleach system	Jonathan P. Kitchin, Mark P. Kirk, Dian E. Stevenson	1993-11-30	$10,816,000
5258274	Thermal dye bleach construction sensitive to ultraviolet radiation	George V. D. Tiers, Dian E. Stevenson	1993-11-02	$9,864,000
5135842	Thermal dye bleach construction	Jonathan P. Kitchin, Mark P. Kirk, Dian E. Stevenson	1992-08-04	$9,106,000
4752559	Primer/antihalation coating for photothermographic constructions	Gregory J. McCarney	1988-06-21	$19,977,000
4681830	Fluorinated carbon-containing developer composition	Craig Burton	1987-07-21	$15,953,000

Randall H. Helland — 12 Patents

Issued Patents All Time

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