(19)
(11) EP 4 277 883 A1

(12)

(43) Date of publication:
22.11.2023 Bulletin 2023/47

(21) Application number: 22700163.3

(22) Date of filing: 12.01.2022
(51) International Patent Classification (IPC): 
C04B 28/14(2006.01)
E04C 2/04(2006.01)
 C04B 38/10(2006.01)
C04B 111/52(2006.01)
(52) Cooperative Patent Classification (CPC):
E04C 2/049; C04B 28/14; C04B 38/106; C04B 2111/52; C04B 2111/0062; B28B 19/0092
 
C-Sets:
  1. C04B 28/14, C04B 14/42, C04B 24/38, C04B 38/106, C04B 40/0028, C04B 40/0263;
  2. C04B 38/106, C04B 24/08, C04B 28/14, C04B 38/0058;
(86) International application number:
PCT/IB2022/050200
(87) International publication number:
WO 2022/153181 (21.07.2022 Gazette 2022/29)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(30) Priority: 13.01.2021 US 202163136977 P
07.01.2022 US 202217647400

(71) Applicant: Knauf Gips KG
97346 Iphofen (DE)

(72) Inventors:
  • SANG, Yijun
    Oak Park, Illinois 60302 (US)
  • SINHA RAY, Suman
    Chicago, Illinois 60660 (US)
  • HEMPHILL, Mark
    Hawthorn Woods, Illinois 60047 (US)

(74) Representative: BSB Patentanwälte Schütte & Engelen Partnerschaft mbB 
Am Markt 10
59302 Oelde
59302 Oelde (DE)

   


(54) OPEN-CELLED GYPSUM CORE, GYPSUM ACOUSTIC PANEL, AND METHOD FOR MAKING SAME