Stem seal for valve assembly of machine engine
US-2021340890-A1 · Nov 4, 2021 · US
with at least one ring of rubber or like material between spindle and housing
with at least one ring of rubber or like material between spindle and housing · Cooperative Patent Classification (CPC)
Engines, pumps, lighting, heating, and mechanical systems.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | F16K41/04 |
| Official title | with at least one ring of rubber or like material between spindle and housing |
| Display label | with at least one ring of rubber or like material between spindle and housing |
| Total patents | 134 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 10 |
| 2016 | 10 |
| 2017 | 7 |
| 2018 | 10 |
| 2019 | 10 |
| 2020 | 9 |
| 2021 | 11 |
| 2022 | 11 |
| 2023 | 13 |
| 2024 | 19 |
| 2025 | 22 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Methods and apparatus to load a valve packing
US-11143314-B1 · Oct 12, 2021 · US
Methods and apparatus to load a valve packing
US-2021301931-A1 · Sep 30, 2021 · US
Dispensing unit having fixed flexible diaphragm seal
US-2021301943-A1 · Sep 30, 2021 · US
Electrically actuated flow control valve and method for operation of the flow control valve
US-2020378519-A1 · Dec 3, 2020 · US
Gate valve bonnet connector
US-2020326006-A1 · Oct 15, 2020 · US
Valve assemblies, valve packing assemblies and related systems and methods
US-2020263809-A1 · Aug 20, 2020 · US
Methods and apparatus to install valve packing components
US-10746320-B2 · Aug 18, 2020 · US
Self-cleaning valve
US-2020256481-A1 · Aug 13, 2020 · US
Multi-pressure rated valve assembly
US-10690261-B2 · Jun 23, 2020 · US
Valve assemblies, valve packing assemblies and related systems and methods
US-10670166-B2 · Jun 2, 2020 · US
Flow rate regulation apparatus and hot water apparatus
US-10670279-B2 · Jun 2, 2020 · US
Valve, aircraft, launch vehicle, and vehicle including the same
US-2020003326-A1 · Jan 2, 2020 · US
Valve assemblies, valve packing assemblies and related systems and methods
US-2019376616-A1 · Dec 12, 2019 · US
Seal structure, and device with said seal structure
US-2019376617-A1 · Dec 12, 2019 · US
Valve and choke stem packing assemblies
US-10415719-B2 · Sep 17, 2019 · US
Sealing system and exhaust gas recirculation valve
US-10378489-B2 · Aug 13, 2019 · US
Seal assembly for a valve stem
US-10359113-B2 · Jul 23, 2019 · US
Rod guide assembly and valve
US-10352465-B2 · Jul 16, 2019 · US
Bushing having a shaft seal
US-2019162325-A1 · May 30, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F16K41/04?
- CPC F16K41/04 is the Cooperative Patent Classification code for “with at least one ring of rubber or like material between spindle and housing.”
- How many patents are filed under CPC F16K41/04 (with at least one ring of rubber or like material between spindle and housing)?
- Our database includes 134 publications tagged with this CPC code.
- Is patent activity under CPC F16K41/04 growing?
- Publication counts under this code: 19 in 2024 vs 22 in 2025 (latest complete years).