CPC technology class · E05

E05D - Hinges Or Suspension Devices For Doors

Hinges or suspension devices for doors, windows or wings. 4,538 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

Compiled by PlainPatent · May 15, 2026

4,538
US patents granted: #4/6
in E05: 14.7%
E05 class share: +6%
5-yr velocity

The verdict

According to USPTO PatentsView, Hinges Or Suspension Devices For Doors ranks #257 of 670 CPC technology areas - 4,538 US patents granted since 2015, with recorded grant volume up 6% over five years.

#257
of 670 CPC technology areas: 4,538
US patents granted, 2015–2025: Samsung
leading assignee (130): +6%
grant velocity, last 5 yrs

How E05D's grant cadence moved

Between 2020–2024, E05D recorded 2,066 grants versus 1,941 in 2015–2019 (+6% equal-window velocity). Across complete years, output peaked in 2019 at 473 grants and bottomed in 2015 at 343 (+38% peak-over-trough). Lead assignee Julius Blum GMBH holds 2.4% of the class ; the top three share 5.6%.

Leaderboard read

E05D concentration, lead at 2.4%

Julius Blum GMBH leads this historical grant record at 2.4% of E05D - foreign corporation assignees hold 59% of class grants (1,263 of 2,125). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share: 2.4%
Top three share: 5.6%
Lead over #2: 25

Where E05D sits inside E05

Among 6 subclasses in E05 (LOCKS; KEYS; Window OR Door FITTINGS; Safes), E05D ranks #4 and holds 14.7% of the parent class's 30,842 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

E05B 9,176 E05Y 8,287 E05F 5,529 E05C 2,961 E05G 351

Rising assignees active in E05D

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 Qingdao Haier Refrigerator Co., Ltd. 32x 2 → 63 company-wide · 11 in E05D
#2 Brose Fahrzeugteile SE & Co. Kommanditgesellschaft, Bamberg 16x 3 → 49 company-wide · 6 in E05D
#3 Moshun, LLC 16x 0 → 16 company-wide · 7 in E05D
#4 Haier Smart Home Co., Ltd. 14x 14 → 199 company-wide · 13 in E05D
#5 Filobe Co., Ltd. 9.00x 0 → 9 company-wide · 6 in E05D

E05D grants by year, peak 2019 (473)

US utility-patent grants per year in E05D, 2015–2025 - recent five years are up 6% versus 2015–2019.

Julius Blum

107
Z124

82
Whirlpool

65
Fositek

46
Compal

39
Acer Incorporated

31
Sugatsune Kogyo

30
First Dome

30
Assa Abloy Entrance…

26
Caldwell Manufacturing…

26
Bsh Hausgeräte

25
Overhead Door

25

What this shows Samsung is the most active filer in E05D, holding 130 of the 4,538 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 E05D
Rank	Company	Patents in E05D
#1	Julius Blum GMBH	107
#2	Z124	82
#3	Whirlpool Corporation	65
#4	Fositek Corporation	46
#5	Compal Electronics, Inc.	39
#6	Acer Incorporated	31
#7	Sugatsune Kogyo Co., Ltd.	30
#8	First Dome Corporation	30
#9	Assa Abloy Entrance Systems AB	26
#10	Caldwell Manufacturing Company North America, LLC	26
#11	BSH Hausgeräte GmbH	25
#12	Overhead Door Corporation	25
#13	Hettich-ONI GmbH & Co. KG	24
#14	Qingdao Haier Joint Stock Co., Ltd.	22
#15	Amesbury Group, Inc.	21
#16	Won-Door Corporation	21
#17	Lenovo (BEIJING) Limited	20
#18	Samet Kalip Ve Madeni Esya San Ve Tic. A.S.	20
#19	Arturo Salice S.P.A.	18
#20	Simonswerk GMBH	16

Footprint here vs. claim strategy

Each dot is a leading E05D 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 E05D assignees by class footprint. Bubble size = patents in E05D. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Classes near E05D's 4,538-grant footprint

Nationwide nearest neighbors for E05D (#257 of 670 by volume ; lead share 2.9%) - not the E05 parent-class siblings above.

Nearest by grant volume

A01B 4,498 B22D 4,425 C03B 4,651 A47G 4,697

Nearest by lead-assignee share

F15B 2.9% B08B 2.9% B63B 2.9% B03B 2.9%

Questions about E05D

Which company holds the most patents in E05D?

Samsung Electronics Co., Ltd. leads E05D with 130 patents (2.4% of the subclass). By PatentsView assignee type, foreign corporations account for 59% of class grants.

Which E05D assignees grew fastest recently?

Among assignees with ≥5 grants in E05D, Qingdao Haier Refrigerator Co., Ltd. shows the highest company-wide grant multiple (32x: 2 grants in 2019–2021 → 63 in 2022–2024) while holding 11 patents in this subclass. Growth is company-wide, not class-only.

How does E05D compare inside parent class E05?

Inside E05 (LOCKS; KEYS; Window OR Door FITTINGS; Safes), E05D ranks #4 of 6 subclasses by grant volume and holds 14.7% of the parent class total. The largest sibling is E05B (9,176 grants).

What to do with this data

E05D in context - here's where to go next.

Julius Blum GMBH leads E05D with 107 grants in this class. See full portfolio
E05D ranks #257 of 670 by grant volume among all tracked CPC technology areas. See the ranking
Inside parent class E05, the largest sibling subclass is E05B with 9,176 grants. Explore E05B

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

Methodology - E05D figures are USPTO PatentsView granted-utility totals for this subclass (4,538 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.