The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 14, 2014
Filed:
Mar. 23, 2007
Robert J. Devoe, Minneapolis, MN (US);
Dennis E. Ferguson, Mahtomedi, MN (US);
Franklyn L. Frederickson, Esko, MN (US);
Mitchell A. F. Johnson, Maplewood, MN (US);
Mikhail L. Pekurovsky, Bloomington, MN (US);
Craig R. Sykora, New Richmond, WI (US);
Jeremy K. Larsen, Eagan, MN (US);
Robert J. DeVoe, Minneapolis, MN (US);
Dennis E. Ferguson, Mahtomedi, MN (US);
Franklyn L. Frederickson, Esko, MN (US);
Mitchell A. F. Johnson, Maplewood, MN (US);
Mikhail L. Pekurovsky, Bloomington, MN (US);
Craig R. Sykora, New Richmond, WI (US);
Jeremy K. Larsen, Eagan, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A process for making a microneedle array master comprises: (a) providing a photoreactive composition, the photoreactive composition comprising: (1) at least one reactive species that is capable of undergoing an acid- or radical-initiated chemical reaction, and (2) at least one multiphoton photoinitiator system; and (b) imagewise exposing at least a portion of the composition to light sufficient to cause simultaneous absorption of at least two photons, thereby inducing at least one acid- or radical-initiated chemical reaction where the composition is exposed to the light, the imagewise exposing being carried out in a pattern that is effective to define at least the surface of a plurality of microneedles. The microneedles may be solid and the outer surface of the microneedles may be characterized by at least one concave area. The master may be used to fabricate a tool for replication.