Gas-lock re-prime shaft passage in submersible well pump and method of re-priming the pump
US-11268516-B2 · Mar 8, 2022 · US
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by means in the suction mouth, e.g. foot valves
by means in the suction mouth, e.g. foot valves · 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 | F04D9/008 |
| Official title | {by means in the suction mouth, e.g. foot valves} |
| Display label | by means in the suction mouth, e.g. foot valves |
| Total patents | 3 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity appears stable based on the most recent years.
| Year | Patents |
|---|---|
| 2017 | 1 |
| 2020 | 1 |
| 2022 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.