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 grant trajectory.

197
US patents granted
#7/11
in B41
0.5%
B41 class share
-7%
5-yr velocity

The verdict

According to USPTO PatentsView, Stamps ranks #601 of 670 CPC technology areas - 197 US patents granted since 2015, with recorded grant volume down 7% over five years.

#601
of 670 CPC technology areas
197
US patents granted, 2015–2025
Trodat
leading assignee (21)
-7%
grant velocity, last 5 yrs

How B41K's grant cadence moved

Between 2020–2024, B41K recorded 89 grants versus 96 in 2015–2019 (-7% equal-window velocity). Across complete years, output peaked in 2016 at 27 grants and bottomed in 2023 at 9 (+200% peak-over-trough). Lead assignee Trodat GmbH holds 10.7% of the class ; the top three share 23.4%.

Leaderboard read

B41K concentration, lead at 10.7%

Trodat GmbH leads this historical grant record at 10.7% of B41K - foreign corporation assignees hold 83% of class grants (85 of 102). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share
10.7%

21 of 197 grants

Top three share
23.4%

of the class's recorded grants

Lead over #2
7

more grants than Colop Stempelerzeugung Skopek Gesellshaft M.B.H. & Co. KG

Where B41K sits inside B41

Among 11 subclasses in B41 (PRINTING; Lining MACHINES; TYPEWRITERS; Stamps), B41K ranks #7 and holds 0.5% of the parent class's 38,209 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

B41J 26,654 B41M 6,377 B41F 2,980 B41P 756 B41N 568 B41C 534 B41L 113 B41D 18

Rising assignees active in B41K

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. #1 Colop Stempelerzeugung Skopek Gesellshaft M.B.H. & Co. KG 7.00x 1 → 7 company-wide · 14 in B41K
  2. #2 My Sweet Petunia, Inc. 0.75x 8 → 6 company-wide · 10 in B41K
  3. #3 Trodat GmbH 0.40x 10 → 4 company-wide · 21 in B41K
  4. #4 Shachihata Inc. 0.29x 7 → 2 company-wide · 11 in B41K
  5. #5 SUN Same Enterprises Co., Ltd. 0.25x 8 → 2 company-wide · 11 in B41K

B41K grants by year, peak 2016 (27)

US utility-patent grants per year in B41K, 2015–2025 - recent five years are down 7% 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

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). Scatter plot of 14 data points (bubble-sized by third dimension). 0510152025 0510152025 Patents in B41K Avg claims / patent (company-wide) TrodatColop Stempelerzeugung…ShachihataSun Same EnterprisesMy Sweet PetuniaBobst MexX Display TechnologyKba-notasysMorphotonics Holding…Parric Ningbo…Kiss Nail ProductsKitaru InnovationsNingbo Major Draft…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).

Questions about B41K

Which company holds the most patents in B41K?
Trodat GmbH leads B41K with 21 patents (10.7% of the subclass). By PatentsView assignee type, foreign corporations account for 83% of class grants.
Which B41K assignees grew fastest recently?
Among assignees with ≥5 grants in B41K, Colop Stempelerzeugung Skopek Gesellshaft M.B.H. & Co. KG shows the highest company-wide grant multiple (7.00x: 1 grants in 2019–2021 → 7 in 2022–2024) while holding 14 patents in this subclass. Growth is company-wide, not class-only.
How does B41K compare inside parent class B41?
Inside B41 (PRINTING; Lining MACHINES; TYPEWRITERS; Stamps), B41K ranks #7 of 11 subclasses by grant volume and holds 0.5% of the parent class total. The largest sibling is B41J (26,654 grants).

What to do with this data

B41K in context - here's where to go next.

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

Methodology - B41K figures are USPTO PatentsView granted-utility totals for this subclass (197 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.