PlainPatent

CPC technology class · B61

B61G - Couplings

Couplings; draught and buffing appliances. 314 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

314
US patents granted
#8/9
in B61
3.9%
B61 class share
+10%
5-yr velocity

The verdict

According to USPTO PatentsView, Couplings ranks #580 of 670 CPC technology areas - 314 US patents granted since 2015, with recorded grant volume up 10% over five years.

#580
of 670 CPC technology areas
314
US patents granted, 2015–2025
Pennsy
leading assignee (19)
+10%
grant velocity, last 5 yrs

How B61G's grant cadence moved

Between 2020–2024, B61G recorded 146 grants versus 133 in 2015–2019 (+10% equal-window velocity). Across complete years, output peaked in 2022 at 38 grants and bottomed in 2018 at 20 (+90% peak-over-trough). Lead assignee Pennsy Corporation holds 6.1% of the class ; the top three share 16.2%.

Leaderboard read

B61G concentration, lead at 6.1%

Pennsy Corporation leads this historical grant record at 6.1% of B61G - us corporation assignees hold 56% of class grants (102 of 183). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share
6.1%

19 of 314 grants

Top three share
16.2%

of the class's recorded grants

Lead over #2
1

more grants than Voith Patent GmbH

Where B61G sits inside B61

Among 9 subclasses in B61 (Railways), B61G ranks #8 and holds 3.9% of the parent class's 8,123 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

B61L 2,671 B61D 1,451 B61B 961 B61C 870 B61F 797 B61K 506 B61H 502 B61J 51

Rising assignees active in B61G

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 Crrc Qingdao Sifang Co., Ltd. 1.22x 32 → 39 company-wide · 7 in B61G
  2. #2 Dellner Couplers AB 1.00x 8 → 8 company-wide · 14 in B61G
  3. #3 Amsted Rail Company, Inc. 1.00x 33 → 33 company-wide · 10 in B61G
  4. #4 Voith Patent GmbH 0.76x 105 → 80 company-wide · 18 in B61G
  5. #5 Pennsy Corporation 0.50x 8 → 4 company-wide · 19 in B61G

B61G grants by year, peak 2022 (38)

US utility-patent grants per year in B61G, 2015–2025 - recent five years are up 10% versus 2015–2019.

152025303540 20152016201720182019202020212022202320242025 24

Who leads B61G?

The 12 most active assignees in COUPLINGS; Draught AND Buffing Appliances - wider bars mean more grants

patents

What this shows Pennsy is the most active filer in B61G, holding 19 of the 314 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 B61G
Rank Company Patents in B61G
#1 Pennsy Corporation 19
#2 Voith Patent GmbH 18
#3 Dellner Couplers AB 14
#4 Bedloe Industries LLC 11
#5 Amsted Rail Company, Inc. 10
#6 Miner Enterprises, inc. 9
#7 Crrc Qingdao Sifang Co., Ltd. 7
#8 Strato, Inc. 7
#9 TTX Company 7
#10 Crrc Qingdao Sifang Rolling Stock Research Institute Co., Ltd. 6
#11 McConway & Torley, LLC 6
#12 Harting Electric GMBH & Co. KG 4
#13 Wabtec Holding Corp. 4
#14 A. Stucki Company 4
#15 Crrc Qiqihar Rolling Stock Co., Ltd. 4
#16 Ireco, LLC 4
#17 Axtone Spolka Akcyjna 4
#18 New York Air Brake LLC 3
#19 Siemens Mobility Austria GmbH 3
#20 Parallel Systems, Inc. 3

Footprint here vs. claim strategy

Each dot is a leading B61G 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 B61G assignees by class footprint. Bubble size = patents in B61G. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 101520253035 05101520 Patents in B61G Avg claims / patent (company-wide) PennsyVoith PatentDellner Couplers AbBedloe IndustriesAmsted RailMiner EnterprisesCrrc Qingdao SifangStratoTtxCrrc Qingdao Sifang…Mcconway & TorleyHarting Electric & KgWabtec HoldingA Stucki
Top 14 B61G assignees by class footprint. Bubble size = patents in B61G. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Questions about B61G

Which company holds the most patents in B61G?
Pennsy Corporation leads B61G with 19 patents (6.1% of the subclass). By PatentsView assignee type, us corporations account for 56% of class grants.
Which B61G assignees grew fastest recently?
Among assignees with ≥5 grants in B61G, Crrc Qingdao Sifang Co., Ltd. shows the highest company-wide grant multiple (1.22x: 32 grants in 2019–2021 → 39 in 2022–2024) while holding 7 patents in this subclass. Growth is company-wide, not class-only.
How does B61G compare inside parent class B61?
Inside B61 (Railways), B61G ranks #8 of 9 subclasses by grant volume and holds 3.9% of the parent class total. The largest sibling is B61L (2,671 grants).

What to do with this data

B61G 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 - B61G figures are USPTO PatentsView granted-utility totals for this subclass (314 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.