A61H 2033/023
With means in the air supply lines to prevent back-feed of water
Official title: {with means in the air supply lines to prevent back-feed of water, e.g. anti-backflow valves, draining devices}
A61H2033/023 (With means in the air supply lines to prevent back-feed of water) appears on 58 US grants and 47 published applications in this corpus.
Search patents in A61H- Granted patents
- 58
- Published applications
- 47
- Assignees
- 33
- Inventors
- 72
- Latest grant
- 23 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 3 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 4 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 1 |
| 2002 | 3 | 2 |
| 2003 | 1 | 1 |
| 2004 | 0 | 2 |
| 2005 | 0 | 4 |
| 2006 | 2 | 3 |
| 2007 | 0 | 2 |
| 2008 | 0 | 1 |
| 2009 | 2 | 2 |
| 2010 | 2 | 0 |
| 2011 | 2 | 1 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 1 | 2 |
| 2015 | 2 | 2 |
| 2016 | 5 | 2 |
| 2017 | 1 | 4 |
| 2018 | 1 | 1 |
| 2019 | 2 | 2 |
| 2020 | 4 | 3 |
| 2021 | 2 | 3 |
| 2022 | 2 | 2 |
| 2023 | 1 | 2 |
| 2024 | 1 | 2 |
| 2025 | 1 | 0 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Air passage unit, air passage system, pool body, and massaging pool23 Dec 2025US 12,502,332 B2Intex Marketing Ltd.
- Air connection piping device for a massage pool, a pool body of a massage pool and a massage pool26 Nov 2024US 12,150,911 B2Intex Marketing Ltd.
- Integrated manifold and valve assembly17 Jan 2023US 11,554,079 B2Wexco Incorporated
- Inflatable spa23 Aug 2022US 11,421,434 B2Intex Marketing Ltd.
- One-way valve and air supply system for massage pool9 Aug 2022US 11,408,523 B2Oriental Recreational Products (Shanghai) Co., Ltd
- Air passage unit, air passage system, pool body, and massaging pool23 Apr 2026US 2026/0108420 A1Intex Marketing Ltd.
- Water flosser with unidirectional sealing device5 Feb 2026US 2026/0033928 A1Thumbs Up Innovations Technology Co., Ltd.
- An air connection piping device for a massage pool, a pool body of a massage pool and a massage pool8 Aug 2024US 2024/0261181 A1Intex Marketing Ltd.
- Inflation System, Massage Pool Air Supply System, and Inflation Method9 May 2024US 2024/0151055 A1Oriental Recreational Products (Shanghai) Co., Ltd
- Air passage unit, air passage system, pool body, and massaging pool19 Oct 2023US 2023/0329966 A1Intex Marketing Ltd.
Most cited
By later US patents
- Air-foam generating apparatus for bath155US 4,004,302 A1977
- Bathtub with improved hydromassage system44US 4,797,958 ATeuco Guzzini S.p.A. · 1989
- Float and check valve for hydrotherapy unit air intake30US 4,168,705 AJacuzzi Bros., Inc. · 1979
- Hydrotherapy system for tubs, spas or pools26US 4,525,881 AJope Manufacturing Co. Inc. · 1985
- Check valve, and hydromassaging apparatus comprising at least one of such a check valve25US 5,381,563 A1995