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For the Inventor, By the Inventor

Maplewood, MN, United States of America

Michael J Simpson

This inventor holds 4 USPTO granted patents. Top assignee: 3M Innovative Properties Company. Active years: 1991-1993.

USPTO Granted Patents = 4

% Patents Active = 100.0

Average Co-Inventor Count = 2.2

ph-index = 4

Forward Citations = 622(Granted Patents)


Location History:

  • Maplewood, MN (US) (1991 - 1992)
  • Saint Paul, MN (US) (1993)

Company Filing History:

goldMedal4 out of 22,361 
 
3M Innovative Properties Company
 patents

Years Active: 1991-1993

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4 patents (USPTO):Explore Patents
1. 5229797 - Multifocal diffractive ophthalmic lenses (1993-07-20),
2. 5129718 - Multi-focal diffractive ophthalmic lenses (1992-07-14),
3. 5116111 - Multi-focal diffractive ophthalmic lenses (1992-05-26),
4. 5076684 - Multi-focal diffractive ophthalmic lenses (1991-12-31),
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