US 12,077,477 B2
Process for forming sintered ceramic bodies having improved properties
Sreeram Balasubramanian, Irvine, CA (US); Yan Yang, Irvine, CA (US); and Akash, Irvine, CA (US)
Assigned to James R. Glidewell Dental Ceramics, Inc., Newport Beach, CA (US)
Filed by James R. Glidewell Dental Ceramics, Inc., Newport Beach, CA (US)
Filed on Oct. 18, 2021, as Appl. No. 17/503,459.
Application 17/503,459 is a division of application No. 16/176,768, filed on Oct. 31, 2018, granted, now 11,148,979.
Claims priority of provisional application 62/579,464, filed on Oct. 31, 2017.
Prior Publication US 2022/0033316 A1, Feb. 3, 2022
Int. Cl. C04B 35/00 (2006.01); A61C 5/00 (2017.01); A61C 5/77 (2017.01); A61C 13/00 (2006.01); B28B 11/00 (2006.01); B28B 11/24 (2006.01); C04B 35/48 (2006.01); C04B 35/486 (2006.01); C04B 35/64 (2006.01)
CPC C04B 35/64 (2013.01) [A61C 13/0006 (2013.01); A61C 13/0022 (2013.01); B28B 11/243 (2013.01); C04B 35/48 (2013.01); C04B 35/486 (2013.01); A61C 5/77 (2017.02); C04B 2235/3246 (2013.01); C04B 2235/6027 (2013.01); C04B 2235/608 (2013.01); C04B 2235/6562 (2013.01); C04B 2235/6567 (2013.01); C04B 2235/661 (2013.01); C04B 2235/785 (2013.01); C04B 2235/96 (2013.01); C04B 2235/9653 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for forming a sintered ceramic body comprising
heating a bisque stage ceramic body in a heating chamber of a sintering oven, comprising
i. in a first heating stage, heating the sintering oven to a first temperature that is from 1200° C. to 1500° C. for an optional first dwell time that is from 0 minutes to 180 minutes, and raising the first temperature by 50° C. to 500° C. to a second temperature between 1400° C. and 1700° C.;
ii. in a second heating stage, holding the second temperature for a second dwell time of between 0 minutes and 20 minutes;
iii. a third heating stage wherein the second temperature is decreased between 50° C. and 200° C. to a third temperature for a dwell time of about 0 minutes to 120 minutes; and
iv. a fourth heating stage wherein the third temperature is increased between 100° C. and 800° C. to a fourth temperature for a dwell time of about 0 minutes to about 5 minutes.