Absorption Chiller Control System Patents: Who Holds the Core Claims
Flat filing activity since 2015, peaking at 10 families in 2024 after a 2022 midpoint of just 2 — this is not a growth market by filing volume. Filings were at zero in 2017, sat near a midpoint of 2 by 2022, and reached a peak of 10 in 2024 — the most recent partial year shows 0, consistent with publication lag rather than an actual drop-off. There is no sustained upward trend across the window.
- 1CARRIER CORP42
- 2KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS16
- 3GAS TECH INST6
- 4YAZAKI CORP6
- 5SANYO ELECTRIC CO LTD5
See the full absorption chiller control system analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions about absorption chiller control patents
How many patents exist for absorption chiller control systems?
This dataset identifies 163 patent families published between 2015 and mid-2026 that combine absorption chiller or absorption refrigeration terminology with control-system claim language, filtered to relevant IPC classes. That figure reflects a specific search scope, not every patent ever filed on absorption cooling generally — broader searches without the control-system filter would return a larger mechanical-refrigeration set. Filing families rather than raw documents gives a fairer count because it neutralises continuation filings and multi-jurisdiction duplicates of the same invention.
Who are the leading patent holders in absorption chiller control technology?
The corpus includes long-established refrigeration and energy-research organisations rather than a single dominant recent filer, and every tracked assignee shows zero filings in the most recent year. Rather than one company pulling ahead, activity is spread thinly and has been essentially flat since a 2022 midpoint of just two filings. Anyone assessing competitive position should look at cumulative family counts and citation influence together, not just the latest year's activity.
What is the most cited patent in absorption chiller control?
US20150345835A1, titled 'Refrigeration system with absorption cooling,' is the most-cited record in this corpus with 68 citations. Close behind are US6651443B1 on integrated absorption cogeneration and the much older US5477696A and US4164128A, both explicitly about absorption chiller control devices, showing that decades-old control concepts still draw significant citation volume. High citation counts here reflect influence within a searched corpus over time and should be read as a signal of historical importance rather than current commercial weight.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Absorption Chiller Control System covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.