PlainPatent

CPC technology class · B41

B41K - Stamps

Stamps; stamping or numbering apparatus or devices. 197 US utility patents granted 2015–2025, with the leading assignees and year-by-year filing trajectory.

197
US patents granted
B41
Parent CPC class
20
Active assignees
+3%
5-yr velocity

The verdict

Stamps ranks #601 of 670 CPC technology areas - 197 US patents granted since 2015, with filing up 3% over five years.

#601
of 670 CPC technology areas
197
US patents granted, 2015–2025
Trodat
leading assignee (21)
+3%
filing velocity, last 5 yrs
Top assignee: Trodat Gmbh (21 patents)

CPC subclass B41K - STAMPS; STAMPING OR NUMBERING APPARATUS OR DEVICES - covers 197 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class B41 (PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS). See our CPC classification guide for how the system works.

The competitive landscape in B41K is shaped by 20 distinct companies actively filing in this space. Trodat Gmbh leads with 21 patents, followed by Colop Stempelerzeugung Skopek Gesellshaft M.b.h. & Co. KG at 14 grants and Shachihata Inc. at 11.

Filing activity in B41K is up 3% over the past five years versus 2015-2019, a relatively steady filing pace. All counts come directly from USPTO PatentsView and reflect US granted utility patents only.

Is B41K innovation accelerating?

US utility-patent grants per year in B41K, 2015–2025 - recent five years are up 3% versus 2015–2019.

51015202530 20152016201720182019202020212022202320242025 10

Who leads B41K?

The 12 most active assignees in STAMPS; STAMPING OR NUMBERING APPARATUS OR DEVICES - wider bars mean more grants

patents

What this shows Trodat is the most active filer in B41K, holding 21 of the 197 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 B41K
Rank Company Patents in B41K
#1 Trodat Gmbh 21
#2 Colop Stempelerzeugung Skopek Gesellshaft M.b.h. & Co. KG 14
#3 Shachihata Inc. 11
#4 SUN SAME Enterprises Co., Ltd. 11
#5 My Sweet Petunia, Inc. 10
#6 Bobst MEX Sa 4
#7 X Display Company Technology Limited 3
#8 Kba-notasys Sa 3
#9 Morphotonics Holding B.v. 3
#10 Parric Ningbo Stationary And Gifts Mfg. Co., Ltd. 3
#11 KISS NAIL Products, Inc. 2
#12 Kitaru Innovations Inc. 2
#13 Ningbo Major Draft Beer Equipment Co., Ltd. 2
#14 Colop Digital Gmbh 2
#15 Chemence, Inc. 2
#16 VMI Holland B.v. 1
#17 Mitsubishi Heavy Industries Machinery Technology Corporation 1
#18 THE Pilot INK Company, Limited 1
#19 Canadian BANK NOTE Company, Limited 1
#20 Gallus Druckmaschinen Gmbh 1

About This Class

CPC subclass B41K belongs to class B41.

197 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 B41K 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 B41K assignees by class footprint. Bubble size = patents in B41K. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Top 14 B41K assignees by class footprint. Bubble size = patents in B41K. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 0510152025 0510152025 Patents in B41K Avg claims / patent (company-wide) TrodatColop Stempelerzeugun…ShachihataSun Same EnterprisesMy Sweet PetuniaBobst MexX Display TechnologyKba-notasysMorphotonics Holding…Parric Ningbo Station…Kiss Nail ProductsKitaru InnovationsNingbo Major Draft Be…Colop Digital
Top 14 B41K assignees by class footprint. Bubble size = patents in B41K. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Frequently Asked Questions

What is CPC class B41K?
CPC subclass B41K covers STAMPS; STAMPING OR NUMBERING APPARATUS OR DEVICES. It belongs to CPC class B41 (PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS), with 197 US utility patents granted since 2015.
How many patents have been filed in B41K?
197 US utility patents were granted in CPC subclass B41K between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in B41K?
Trodat Gmbh leads B41K with 21 patents, making it the most active assignee in this technology area.
How is patent data for B41K 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., B41) is a broad technology category. Subclasses like B41K 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.