Samuel L Sanders

US Patent:

20220305724, Sep 29, 2022

Filed:

Jun 17, 2020

Appl. No.:

17/618988

Inventors:

- Cambridge MA, US
Samuel N. Sanders - Cambridge MA, US

Assignee:

President and Fellows of Harvard College - Cambridge MA

International Classification:

B29C 64/135
B29C 64/106

Abstract:

Articles and methods for increasing the triplet upconversion threshold, e.g., by utilizing a triplet exciton acceptor lower in energy than the sensitizer or upconverter, are generally described. Some embodiments, for example, are directed to articles and methods that use a triplet sensitizer, an upconverter, and an acceptor to produce upconverted photons (e.g., light of a second energy). The light can be used to polymerize a polymerizable species. Other upconversion configurations can also be used in other embodiments. In some cases, this may allow true 3D printing to be achieved due to improved control of light absorption, e.g., without needing to “print” on a layer-by-layer basis.

US Patent:

20230094821, Mar 30, 2023

Filed:

Dec 2, 2022

Appl. No.:

18/073702

Inventors:

- CHARLESTOWN MA, US
Peter T. Kazlas - Sudbury MA, US
Samuel N. Sanders - Arlington MA, US
Daniel N. Congreve - Palo Alto CA, US

International Classification:

B29C 64/277
B29C 64/135
B33Y 10/00
B33Y 30/00

Abstract:

The present invention relates to methods and systems for volumetric printing a three-dimensional object. The methods and systems include achieving polymerization in a photopolymerizable liquid at the intersection of a first optical projection of excitation light and second optical projection of excitation light comprising a sheet of excitation light.