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 filing trajectory.

416
US patents granted
F28
Parent CPC class
20
Active assignees
+2%
5-yr velocity

The verdict

Steam OR Vapour Condensers ranks #555 of 670 CPC technology areas - 416 US patents granted since 2015, with filing up 2% over five years.

#555
of 670 CPC technology areas
416
US patents granted, 2015–2025
Evapco
leading assignee (20)
+2%
filing velocity, last 5 yrs
Top assignee: Evapco, Inc. (20 patents)

CPC subclass F28B - STEAM OR VAPOUR CONDENSERS - covers 416 US utility patents granted between 2015 and 2025 according to USPTO PatentsView records, within the broader CPC class F28 (HEAT EXCHANGE IN GENERAL). See our CPC classification guide for how the system works.

The competitive landscape in F28B is shaped by 20 distinct companies actively filing in this space. Evapco, Inc. leads with 20 patents, followed by Holtec International at 13 grants and Heatcraft Refrigeration Products Llc at 7.

Filing activity in F28B is up 2% 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 F28B innovation accelerating?

US utility-patent grants per year in F28B, 2015–2025 - recent five years are up 2% 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

About This Class

CPC subclass F28B belongs to class F28.

416 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 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).

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 Refrigerati…OrmatBaltimore AircoilEnergy and Environmen…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).

Frequently Asked Questions

What is CPC class F28B?
CPC subclass F28B covers STEAM OR VAPOUR CONDENSERS. It belongs to CPC class F28 (HEAT EXCHANGE IN GENERAL), with 416 US utility patents granted since 2015.
How many patents have been filed in F28B?
416 US utility patents were granted in CPC subclass F28B between 2015 and 2025, based on USPTO PatentsView data.
Which company holds the most patents in F28B?
Evapco, Inc. leads F28B with 20 patents, making it the most active assignee in this technology area.
How is patent data for F28B 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., F28) is a broad technology category. Subclasses like F28B 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.