PlainPatent

CPC technology class · B28

B28B - Shaping CLAY OR Other Ceramic Compositions

Shaping clay or other ceramic compositions; shaping slag; shaping mixtures containing cementitious material, e.g. plaster. 3,309 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

3,309
US patents granted
B28
Parent CPC class
20
Active assignees
+71%
5-yr velocity

The verdict

Shaping CLAY OR Other Ceramic Compositions ranks #303 of 670 CPC technology areas - 3,309 US patents granted since 2015, with filing up 71% over five years.

#303
of 670 CPC technology areas
3,309
US patents granted, 2015–2025
Corning Incorporated
leading assignee (157)
+71%
filing velocity, last 5 yrs
Top assignee: Corning Incorporated (157 patents)

CPC subclass B28B - SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER - covers 3,309 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class B28 (WORKING CEMENT, CLAY, OR STONE). See our CPC classification guide for how the system works.

The competitive landscape in B28B is shaped by 20 distinct companies actively filing in this space. Corning Incorporated leads with 157 patents, followed by NGK Insulators, Ltd. at 112 grants and United States Gypsum Company at 60.

Filing activity in B28B is up 71% over the past five years versus 2015-2019, a sharp acceleration suggesting an emerging or fast-moving technology area. All counts come directly from USPTO PatentsView and reflect US granted utility patents only.

Is B28B innovation accelerating?

US utility-patent grants per year in B28B, 2015–2025 - recent five years are up 71% versus 2015–2019.

150200250300350400 20152016201720182019202020212022202320242025 238

Who leads B28B?

The 12 most active assignees in SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER - wider bars mean more grants

patents

What this shows Corning Incorporated is the most active filer in B28B, holding 157 of the 3,309 patents in this class. Concentration at the top signals how contestable this technology area is for new entrants.

Source USPTO PatentsView, granted utility patents As of 2015–2025 grant years
View data table
Top patent holders in CPC subclass B28B
Rank Company Patents in B28B
#1 Corning Incorporated 157
#2 NGK Insulators, Ltd. 112
#3 United States Gypsum Company 60
#4 Concept Laser, Gmbh 36
#5 Seurat Technologies, Inc. 33
#6 Velo3d, Inc. 30
#7 Arcam AB 29
#8 Cambria Company Llc 25
#9 Desktop Metal, Inc. 25
#10 Voxeljet Ag 20
#11 Certainteed Gypsum, Inc. 19
#12 EOS Gmbh Electro Optical Systems 18
#13 Solidia Technologies, Inc. 18
#14 ICON Technology, Inc. 17
#15 Safran Ceramics 16
#16 Knauf Gips KG 15
#17 Ibiden Co., Ltd. 13
#18 Elematic Oyj 13
#19 Yoshino Gypsum Co., Ltd. 12
#20 Pavestone, Llc 12

About This Class

CPC subclass B28B belongs to class B28.

3,309 patents were granted in this class between 2015 and 2025.

20 companies actively patent in this space.

Classification System

Cooperative Patent Classification (CPC) is a hierarchical patent classification system used by the USPTO and EPO.

← All Technology Classes Technology Rankings →

Footprint here vs. claim strategy

Each dot is a leading B28B assignee, placed by how many patents it holds in this class (horizontal) against its company-wide average claims per patent (vertical) - a read on whether the class is led by broad-but-shallow filers or focused deep-claim players.

Top 14 B28B assignees by class footprint. Bubble size = patents in B28B. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Top 14 B28B assignees by class footprint. Bubble size = patents in B28B. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 0102030 050100150200 Patents in B28B Avg claims / patent (company-wide) Corning IncorporatedNgk InsulatorsUnited States GypsumConcept LaserSeuratVelo3dArcam AbCambriaDesktop MetalVoxeljetCertainteed GypsumEos Electro Optical S…SolidiaIcon Technology
Top 14 B28B assignees by class footprint. Bubble size = patents in B28B. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class B28B?
CPC subclass B28B covers SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER. It belongs to CPC class B28 (WORKING CEMENT, CLAY, OR STONE), with 3,309 US utility patents granted since 2015.
How many patents have been filed in B28B?
3,309 US utility patents were granted in CPC subclass B28B between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in B28B?
Corning Incorporated leads B28B with 157 patents, making it the most active assignee in this technology area.
How is patent data for B28B collected?
Patent data comes from USPTO PatentsView, a public research dataset maintained by the United States Patent and Trademark Office. It covers all US granted utility patents and assigns CPC codes based on the technology described in each patent.
What is the difference between CPC class and subclass?
A CPC class (e.g., B28) is a broad technology category. Subclasses like B28B provide finer granularity within that category. PlainPatent organizes data at the subclass level (4-character codes) for the most useful view of technology domains.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from USPTO PatentsView - official U.S. government patent data. See our methodology for computation details. Retrieved and formatted by PlainPatent Editorial

Every figure on PlainPatent is rendered directly from USPTO source data, no number is typed in by an editor. This page draws directly on USPTO source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.