C04B 28/141
Containing dihydrated gypsum before the final hardening step
Official title: {containing dihydrated gypsum before the final hardening step, e.g. forming a dihydrated gypsum product followed by a de- and rehydration step}
C04B28/141 (Containing dihydrated gypsum before the final hardening step) appears on 23 US grants and 37 published applications in this corpus.
Search patents in C04B- Granted patents
- 23
- Published applications
- 37
- Assignees
- 25
- Inventors
- 113
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
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| 2007 | 0 | 1 |
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| 2015 | 1 | 1 |
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| 2017 | 1 | 1 |
| 2018 | 1 | 3 |
| 2019 | 1 | 1 |
| 2020 | 1 | 5 |
| 2021 | 2 | 0 |
| 2022 | 2 | 1 |
| 2023 | 0 | 3 |
| 2024 | 0 | 8 |
| 2025 | 2 | 4 |
| 2026 | 2 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Methods for manufacturing building boards28 Jul 2026US 12,691,607 B2CertainTeed Gypsum, Inc.
- Grinding aid for cement and preparation method therefor24 Feb 2026US 12,559,433 B2Jiahua Science & Technology Development (Shanghai) Ltd.
- Board with fiber-reinforced dense layer16 Sep 2025US 12,415,765 B2Knauf Gips KG
- Wet accelerator, a method of preparing a wet accelerator and a method of producing a gypsum product26 Aug 2025US 12,398,075 B2Saint-Gobain Placo
- Method for producing solidifying material for radioactive waste disposal via recycling of radioactive concrete and method for disposing of radioactive waste using the same16 Aug 2022US 11,417,438 B2Korea Institute of Civil Engineering and Building Technology
- Building boards and methods for manufacturing same8 Oct 2026US 2026/0307294 A1CertainTeed Gypsum, Inc.
- Sustainable brick composition and method of preparation thereof17 Sep 2026US 2026/0274751 A1King Fahd University of Petroleum and Minerals
- Synthesis of cement from alternative raw materials and fuels that reduces or eliminates co2 emissions6 Aug 2026US 2026/0225957 A1Batuga Tech LLC
- Continuous cementitious board manufacturing with in situ foam generation16 Jul 2026US 2026/0200132 A1United States Gypsum Company
- Hardened gypsum body, and preparation method therefor and use thereof11 Jun 2026US 2026/0158703 A1Hubei Juhai Environmental Technology Co., Ltd.
Most cited
By later US patents
- Process of producing gypsum wood fiber product having improved water resistance67US 5,817,262 AUnited States Gypsum Company · 1998
- Method for the production of fibrous plaster boards32US 4,840,688 APfleiderer Industrie GmbH & Co., KG · 1989
- Method of and apparatus for producing gypsum fiber boards (plasterboard)28US 4,734,163 ABabcock-BSH GmbH · 1988
- Process for making gypsum fiberboard16US 4,966,739 ABabcock BSH Aktiengesellschaft Vormals Buttner-Schilde-Haas AG · 1990
- Method of preparing gypsum articles10US 4,443,261 ATenax Maskin AB · 1984