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 grant trajectory.

Compiled by PlainPatent · May 15, 2026

3,309
US patents granted: #1/3
in B28: 64.4%
B28 class share: +50%
5-yr velocity

The verdict

According to USPTO PatentsView, Shaping Clay Or Other Ceramic Compositions ranks #303 of 670 CPC technology areas - 3,309 US patents granted since 2015, with recorded grant volume up 50% over five years.

#303
of 670 CPC technology areas: 3,309
US patents granted, 2015–2025: Corning Incorporated
leading assignee (157): +50%
grant velocity, last 5 yrs

How B28B's grant cadence moved

Between 2020–2024, B28B recorded 1,743 grants versus 1,159 in 2015–2019 (+50% equal-window velocity). Across complete years, output peaked in 2024 at 378 grants and bottomed in 2015 at 171 (+121% peak-over-trough). Lead assignee Corning Incorporated holds 4.7% of the class ; the top three share 9.9%.

Leaderboard read

B28B concentration, lead at 4.7%

Corning Incorporated leads this historical grant record at 4.7% of B28B - us corporation assignees hold 53% of class grants (771 of 1,446). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 4.7%
Top three share: 9.9%
Lead over #2: 45

Where B28B sits inside B28

Among 3 subclasses in B28 (Working Cement, Clay, OR Stone), B28B ranks #1 and holds 64.4% of the parent class's 5,141 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

B28D 1,321 B28C 511

Rising assignees active in B28B

Company-wide grant multiples (2022–2024 vs 2019–2021) among assignees with ≥5 patents in this subclass. Growth is company-wide; class patent counts are subclass-specific.

#1 Peri SE 35x 0 → 35 company-wide · 7 in B28B
#2 Gold Bond Building Products, LLC 25x 1 → 25 company-wide · 6 in B28B
#3 Samsung E&A Co., Ltd. 7.00x 0 → 7 company-wide · 5 in B28B
#4 Carbicrete Inc. 6.00x 1 → 6 company-wide · 8 in B28B
#5 Icon Technology, Inc. 4.67x 3 → 14 company-wide · 17 in B28B

B28B grants by year, peak 2024 (378)

US utility-patent grants per year in B28B, 2015–2025 - recent five years are up 50% versus 2015–2019.

Corning Incorporated

157
Ngk Insulators

112
United States Gypsum

60
Concept Laser

36
Seurat

33
Velo3d

30
Arcam Ab

29
Cambria

25
Desktop Metal

25
Voxeljet

20
Certainteed Gypsum

19
Eos Electro Optical…

18

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.

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

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).

Classes near B28B's 3,309-grant footprint

Nationwide nearest neighbors for B28B (#303 of 670 by volume ; lead share 4.7%) - not the B28 parent-class siblings above.

Nearest by grant volume

F24S 3,307 E02D 3,369 A23K 3,247 G01G 3,374

Nearest by lead-assignee share

G01T 4.7% F17C 4.8% G16C 4.8% F16H 4.8%

Questions about B28B

Which company holds the most patents in B28B?

Corning Incorporated leads B28B with 157 patents (4.7% of the subclass). By PatentsView assignee type, us corporations account for 53% of class grants.

Which B28B assignees grew fastest recently?

Among assignees with ≥5 grants in B28B, Peri SE shows the highest company-wide grant multiple (35x: 0 grants in 2019–2021 → 35 in 2022–2024) while holding 7 patents in this subclass. Growth is company-wide, not class-only.

How does B28B compare inside parent class B28?

Inside B28 (Working Cement, Clay, OR Stone), B28B ranks #1 of 3 subclasses by grant volume and holds 64.4% of the parent class total. The largest sibling is B28D (1,321 grants).

What to do with this data

B28B in context - here's where to go next.

Corning Incorporated leads B28B with 157 grants in this class. See full portfolio
B28B ranks #303 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class B28, the largest sibling subclass is B28D with 1,321 grants. Explore B28D

Figures reflect USPTO PatentsView grant data through 2026-05-15; pending applications not yet granted are not counted.

Methodology - B28B figures are USPTO PatentsView granted-utility totals for this subclass (3,309 grants in the tracked window).

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.