US 11,685,110 B2
Reduction of polymerization inhibitor irregularity on additive manufacturing windows
Bob E. Feller, San Mateo, CA (US); and R. Griffin Price, Redwood City, CA (US)
Assigned to Carbon, Inc., Redwood City, CA (US)
Filed by Carbon, Inc., Redwood City, CA (US)
Filed on Jul. 25, 2022, as Appl. No. 17/872,227.
Application 17/872,227 is a division of application No. 16/490,137, granted, now 11,400,644, previously published as PCT/US2018/057273, filed on Oct. 24, 2018.
Claims priority of provisional application 62/578,008, filed on Oct. 27, 2017.
Prior Publication US 2022/0355539 A1, Nov. 10, 2022
Int. Cl. B29C 64/124 (2017.01); B33Y 10/00 (2015.01); B33Y 30/00 (2015.01); B33Y 40/00 (2020.01); B29C 64/321 (2017.01); B29C 64/364 (2017.01); B29C 64/245 (2017.01)
CPC B29C 64/124 (2017.08) [B29C 64/245 (2017.08); B29C 64/321 (2017.08); B29C 64/364 (2017.08); B33Y 10/00 (2014.12); B33Y 30/00 (2014.12); B33Y 40/00 (2014.12)] 14 Claims
OG exemplary drawing
 
1. A method of reducing irregularity of an oxygen gradient across the window of a bottom-up additive manufacturing apparatus during production of a three-dimensional object thereon, comprising:
(a) producing said object from a polymerizable liquid on a window, said window comprising:
(i) an optically transparent semipermeable member, on which semipermeable member said three-dimensional object is produced;
(ii) a fluid supply bed in or adjacent said semipermeable member, from which supply bed a polymerization inhibitor is fed through said semipermeable member;
(iii) at least a first and second fluid orifice connected to said supply bed on opposite sides thereof and in fluid communication with one another through said supply bed; while
(b) feeding a fluid comprising said polymerization inhibitor through one of said orifices, optionally while drawing a vacuum through the other of said orifices; and
(c) periodically reversing the flow of the fluid through said supply bed.