PlainPatent

CPC technology class · F28

F28B - Steam Or Vapour Condensers

Steam or vapour condensers. 416 US utility patents granted 2015–2025, with the leading assignees and year-by-year grant trajectory.

416
US patents granted
#5/5
in F28
1.9%
F28 class share
-8%
5-yr velocity

The verdict

According to USPTO PatentsView, Steam Or Vapour Condensers ranks #555 of 670 CPC technology areas - 416 US patents granted since 2015, with recorded grant volume down 8% over five years.

#555
of 670 CPC technology areas
416
US patents granted, 2015–2025
Evapco
leading assignee (20)
-8%
grant velocity, last 5 yrs

How F28B's grant cadence moved

Between 2020–2024, F28B recorded 179 grants versus 194 in 2015–2019 (-8% equal-window velocity). Across complete years, output peaked in 2019 at 59 grants and bottomed in 2015 at 21 (+181% peak-over-trough). Lead assignee Evapco, Inc. holds 4.8% of the class ; the top three share 9.6%.

Leaderboard read

F28B concentration, lead at 4.8%

Evapco, Inc. leads this historical grant record at 4.8% of F28B - us corporation assignees hold 65% of class grants (84 of 129). Figures describe granted US utility patents in this CPC subclass, not current investment or legal strength.

Leader's share
4.8%

20 of 416 grants

Top three share
9.6%

of the class's recorded grants

Lead over #2
7

more grants than Holtec International

Where F28B sits inside F28

Among 5 subclasses in F28 (Heat Exchange IN General), F28B ranks #5 and holds 1.9% of the parent class's 21,601 recorded grants. Sibling chips below are the other subclasses in the same parent class, not the nationwide volume/lead-share peers further down.

F28F 10,136 F28D 10,118 F28C 493 F28G 438

Rising assignees active in F28B

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 Energy and Environmental Research Center Foundation 4.40x 5 → 22 company-wide · 6 in F28B
  2. #2 OVH 2.58x 24 → 62 company-wide · 5 in F28B
  3. #3 Ormat Technologies Inc. 1.75x 4 → 7 company-wide · 7 in F28B
  4. #4 Evapco, Inc. 1.20x 20 → 24 company-wide · 20 in F28B
  5. #5 Holtec International 1.12x 43 → 48 company-wide · 13 in F28B

F28B grants by year, peak 2019 (59)

US utility-patent grants per year in F28B, 2015–2025 - recent five years are down 8% versus 2015–2019.

10203040506070 20152016201720182019202020212022202320242025 19

Who leads F28B?

The 12 most active assignees in Steam OR Vapour Condensers - wider bars mean more grants

patents

What this shows Evapco is the most active filer in F28B, holding 20 of the 416 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 F28B
Rank Company Patents in F28B
#1 Evapco, Inc. 20
#2 Holtec International 13
#3 Heatcraft Refrigeration Products LLC 7
#4 Ormat Technologies Inc. 7
#5 Baltimore Aircoil Company, Inc. 6
#6 Energy and Environmental Research Center Foundation 6
#7 OVH 5
#8 Dana Canada Corporation 4
#9 Gradiant Corporation 4
#10 Elivac Co., Ltd. 4
#11 JGC Corporation 3
#12 Danfoss Micro Channel Heat Exchanger (JIAXING) Co., Ltd. 3
#13 Other LAB, LLC 3
#14 Orcan Energy AG 3
#15 Hudson Products Corporation 3
#16 Toshiba Carrier Corporation 2
#17 Advanced Cooling Technologies, Inc. 2
#18 Woodside Energy Technologies Pty Ltd 2
#19 Prime Datum, Inc. 2
#20 Sanhua (HANGZHOU) Micro Channel Heat Exchanger Co., Ltd. 1

Footprint here vs. claim strategy

Each dot is a leading F28B 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 F28B assignees by class footprint. Bubble size = patents in F28B. Source: USPTO PatentsView (claim depth is company-wide across all classes). Scatter plot of 14 data points (bubble-sized by third dimension). 51015202530 0510152025 Patents in F28B Avg claims / patent (company-wide) EvapcoHoltec InternationalHeatcraft Refrigeratio…OrmatBaltimore AircoilEnergy and Environment…OvhDana CanadaGradiantElivacJgcDanfoss Micro Channel…Other LabOrcan Energy
Top 14 F28B assignees by class footprint. Bubble size = patents in F28B. Source: USPTO PatentsView (claim depth is company-wide across all classes).

Questions about F28B

Which company holds the most patents in F28B?
Evapco, Inc. leads F28B with 20 patents (4.8% of the subclass). By PatentsView assignee type, us corporations account for 65% of class grants.
Which F28B assignees grew fastest recently?
Among assignees with ≥5 grants in F28B, Energy and Environmental Research Center Foundation shows the highest company-wide grant multiple (4.40x: 5 grants in 2019–2021 → 22 in 2022–2024) while holding 6 patents in this subclass. Growth is company-wide, not class-only.
How does F28B compare inside parent class F28?
Inside F28 (Heat Exchange IN General), F28B ranks #5 of 5 subclasses by grant volume and holds 1.9% of the parent class total. The largest sibling is F28F (10,136 grants).

What to do with this data

F28B 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 - F28B figures are USPTO PatentsView granted-utility totals for this subclass (416 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.