USPTO 2015–2025 USPTO PatentsView Foreign Corporation

Rinnai Corporation

USPTO PatentsView assignee record - 119 granted patents across 36 technology areas, active 2015–2025. Filing-trend and competitive-moat analysis cross-referenced to USPTO Patent Public Search. Primary class: F24H (FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL).

Compiled byPlainPatent Editorial, US Patent Intelligence Editorial Team · May 15, 2026

Explore the portfolio See the ranking

119

Total patents granted

CPC technology areas

4.5

Avg claims per patent

+2%

5-year filing velocity

The verdict

Rinnai holds 119 US patents across 36 technology areas, rank #3,161 of 50,000 tracked assignees.

#3,161
of 50,000 US assignees by volume: Top 27%
by Innovation Score (44.0/100): 4.5
avg claims per patent: +2%
filing velocity, last 5 yrs

Portfolio overview

Rinnai Corporation has been granted 119 US utility patents between 2015 and 2025, placing Rinnai Corporation at rank #3,161 across all assignees tracked by PlainPatent. This portfolio spans 36 distinct Cooperative Patent Classification (CPC) subclasses, averaging 4.5 claims per patent with primary concentration in F24H (FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL). As a Foreign Corporation, Rinnai Corporation is one of the more focused assignees in the PatentsView dataset. By volume, Rinnai sits between ICOM Incorporated (119 patents, rank #3,157) and Telebrands Corp. (119 patents, rank #3,165) - the closest US assignees by grant volume. The composite Innovation Score of 44.0/100 blends portfolio volume, filing velocity, technology breadth, and claim depth into a single comparable measure drawn directly from USPTO PatentsView records.

Filing cadence tells the strategic story. Between 2020 and 2025 the company received 60 grants, compared with 59 in the 2015–2019 window, a +2% shift in five-year velocity. Steady filing volume suggests sustained innovation without dramatic pivots. The Foreign Corporation classification further shapes interpretation, since corporate, government, and individual filers pursue patents for materially different reasons.

Claim depth and technology breadth together indicate competitive posture. Rinnai Corporation's 4.5 average claims per patent suggests focused, narrowly drawn claims typical of single-invention filings, while a multi-domain presence across 36 subclasses balances depth with breadth. Combined with portfolio volume, these signals let analysts, investors, and licensing professionals benchmark Rinnai Corporation against peers pursuing similar technology classes.

ICOM Incorporated

119
Lifetime Brands

119
Nippon Steel Chem…

119
Ottobock SE & KGAA

119
Rolls-royce High…

119
Suzhou Metabrain…

119
Swisscom

119
Telebrands

119
Rinnai ◀

119

What this shows Rinnai holds 119 patents at rank #3,161, shown against the 8 assignees closest to it in grant volume rather than the industry's largest filers.

Companies ranked near Rinnai

By rank, the assignees closest to #3,161 in granted patent volume.

Leaders in F24H (Fluid Heaters)

Other assignees with the most granted patents in Rinnai's primary technology class.

Rinnai's Innovation Score vs. every tracked assignee

Composite of portfolio volume, filing velocity, technology breadth, and claim depth (0–100)

44 Top 27% higher than 73% of 50,000 US assignees

Each bar is a band; taller bars hold more US assignees. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source USPTO PatentsView, PlainPatent Innovation Score · 2015–2025

USPTO utility patent grants by year · 2015–2025

Grants by year

Teal-shaded recent years (2020–present) versus the 2015–2019 baseline. Full figures in the table below.

View data table

Rinnai Corporation patent grants by year, 2015–2025
Year	Patents Granted	Share of Period
2015	6	5.0%
2016	3	2.5%
2017	13	10.9%
2018	15	12.6%
2019	22	18.5%
2020	16	13.4%
2021	12	10.1%
2022	12	10.1%
2023	4	3.4%
2024	11	9.2%
2025	5	4.2%

Which technologies does Rinnai Corporation patent most?

F24H - FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL 62

F23D - BURNERS 45

Y02B - CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS 23

F28F - DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION 22

F28D - HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT 21

F23N - REGULATING OR CONTROLLING COMBUSTION 20

F24D - DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR 15

F23L - SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS ; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES 13

F16K - VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING 7

G05D - SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES 6

F23M - CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR 6

F23K - FEEDING FUEL TO COMBUSTION APPARATUS 6

Y02E - REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION 5

Y10T - TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION 4

F04D - NON-POSITIVE-DISPLACEMENT PUMPS 4

Top 15 of 36 technology areas

Patent Moat Analysis

Portfolio Volume Moderate

Tech Breadth Multi-domain

Claim Depth Simple

Velocity Growing

Where it ranks

Overall rank by patents

#3,161

Across all tracked assignees

Innovation Score

44.0 out of 100

View all rankings →

Data Source

USPTO PatentsView, US granted patents 2015–2025

How is Innovation Score calculated?

Frequently Asked Questions

How many patents does Rinnai Corporation hold?

Rinnai Corporation holds 119 US granted patents filed between 2015 and 2025, spanning 36 technology areas.

What is Rinnai Corporation's Innovation Score?

Rinnai Corporation has an Innovation Score of 44.0 out of 100. This composite metric weighs portfolio volume (40%), filing velocity (20%), technology breadth (25%), and claim depth (15%).

What technology areas does Rinnai Corporation focus on?

Rinnai Corporation's top technology area is F24H (FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL) with 62 patents. The company has filed patents in 36 CPC subclasses total.

Is Rinnai Corporation's patent filing rate increasing or decreasing?

Rinnai Corporation's recent filing velocity is +2% compared to the prior five-year period. The company is maintaining or growing its patent output.

What does claim depth mean for Rinnai Corporation's patents?

Rinnai Corporation's patents average 4.5 claims each. This is relatively simple claim structure, typical for focused inventions.

How is the Rinnai Corporation patent data sourced?

All patent data comes from USPTO PatentsView, a public research dataset maintained by the United States Patent and Trademark Office covering US granted utility patents from 2015 to 2025.

How to use this portfolio

Rinnai's 119 grants land it in the top 27% by Innovation Score, but volume alone doesn't tell you where the strength sits.

Read that count against the largest US assignees before treating it as dominance - Rinnai ranks #3,161 of 50,000. Top 50 holders
Most of this portfolio concentrates in F24H - see who else leads that technology area. F24H leaders
Check what the four-part Innovation Score actually rewards before comparing it to another company. How the score works

Patent counts and the Innovation Score measure patenting activity, not commercial success or the legal strength of any patent. Many patents are filed defensively. Verify the status of an individual patent against official USPTO records.

Data sourced from USPTO PatentsView - official U.S. government patent data. See our methodology for computation details. Retrieved and formatted by PlainPatent Editorial

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the USPTO PatentsView database. Consult a qualified professional before making decisions based on this data.

Read our methodology - how this data is sourced, computed, and verified.

Data sources used on this page

USPTO PatentsView - the disambiguated bulk patent-grant, assignee, and CPC data this page's figures are derived from. patentsview.org
Cooperative Patent Classification (CPC) - the joint USPTO/EPO classification scheme used to group patents by technology area. cooperativepatentclassification.org
USPTO Patent Public Search - the official interface to verify the status of any individual patent. ppubs.uspto.gov

Compiled byPlainPatent Editorial, US Patent Intelligence Editorial Team · May 15, 2026

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. Data current as of May 2026.