David C. Weigel — 13 Patents at 3M

David C. Weigel has been granted 13 US patents while listed as an inventor at 3M. The first was granted in 1982 and the most recent in November 1996. David C. Weigel ranks #362,438 of 4,157,543 US inventors in our database (top 8.7%). Patent records list David C. Weigel in White Bear Lake, MN, US.

Issued Patents All Time

Showing 1–13 of 13 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
5576074	Laser write process for making a conductive metal circuit	David A. Morgan	1996-11-19	$18,878,000
5278024	Positive imaging diffusion-transfer dry silver system using formazan dye	Richard C. Cotner, Kumars Sakizadeh	1994-01-11	$14,918,000
5275932	Thermal development accelerators for thermographic materials	Oanh V. Pham	1994-01-04	$11,841,000
5206112	Positive imaging diffusion - transfer dry silver system	Richard C. Cotner, Kumars Sakizadeh	1993-04-27	$15,959,000
5185231	Dry silver systems with fluoran leuco dyes	—	1993-02-09	$11,474,000
5026633	Color photothermographic materials with development accelerator	—	1991-06-25	$7,237,000
4923792	Color photothermographic elements	Duncan M. A. Grieve, Stephen S. Poon, Tran V. Thien, Kumars Sakizadeh	1990-05-08	$8,954,000
4883747	Color photothermographic elements	Duncan M. A. Grieve, Stephen S. Poon, Tran V. Thien, Kumars Sakizadeh	1989-11-28	$3,948,000
4795697	Stabilization of ketazine dyes	Kim M. Vogel, Roger A. Mader	1989-01-03	$9,608,000
4782010	Photohermographic emulsions having stable color forming developers	Roger A. Mader, Louis M. Leichter, Kristen A. Hoff	1988-11-01	$6,204,000
4587211	Photothermographic stabilizers for syringaldazine leuco dyes	Takuzo Ishida	1986-05-06	$3,451,000
4585734	Photothermographic toners	—	1986-04-29	$8,030,000
4328181	Indicator material	Leon W. Anders	1982-05-04	$4,249,000

David C. Weigel — 13 Patents

Issued Patents All Time

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