Patents
US 11339804 B2: Self-cleaning pump
- Granted
- 2022-05-24
- Filed
- 2018-08-01 application 16051538
- Type
- Utility · 19 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
A pump comprising a volute housing, a rotatable shaft, and an impeller. The volute housing comprises a volute cavity side wall, an upper cylindrical wall, and an upper wall. The upper cylindrical wall extends upwardly from an upper perimeter edge and includes an upper recessed notch formed therein. The upper wall extends radially inwardly from the upper cylindrical wall. The rotatable impeller is operatively coupled to the rotatable shaft and comprises a top cylindrical wall and a top flange. The top cylindrical wall extends upwardly from a top perimeter edge of the top flange and includes a top recessed notch formed therein. The top cylindrical wall is separated from the upper cylindrical wall of the volute housing by an upper annular gap. The top recessed notch of the rotatable impeller and the upper recessed notch of the volute housing may be slot-shaped or wedge-shaped.
Source: PVGPATDIS, file of 2026-04-10 (ipg220524.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| Liberty Pumps, Inc. 23 patents | US company or organization | Bergen, NY | PVGPATDIS, file of 2026-04-10 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| Donald M. Pohler | North Chili, NY | 14 | PVGPATDIS, file of 2026-04-10 | |
| David M. Williams | Attica, NY | 20 | PVGPATDIS, file of 2026-04-10 | |
| Brad Sawyer | Hilton, NY | 1 | PVGPATDIS, file of 2026-04-10 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| F04D | Non-positive-displacement pumps | F04D7/04 | PVGPATDIS, file of 2026-04-10 |
Cooperative Patent Classification, as currently assigned (one row per subclass).
Assignments and security interests
| Recorded | What | From | To | Reel/frame | Source |
|---|---|---|---|---|---|
| 2018-09-29 | Assignment Assignment of assignor's interest | POHLER, DONALD M. signed 2018-09-20 SAWYER, BRAD signed 2018-09-20 WILLIAMS, DAVID M. signed 2018-09-20 | LIBERTY PUMPS, INC. BERGEN, NY | 47013/617 | ECORSEXC, file of 2026-09-25 |
Documents recorded with the USPTO Assignment Recordation Branch that list this patent. A security interest is a lender’s claim on the patent as collateral; a release ends it.
USPTO bulk data: PatentsView granted patents, disambiguated (PVGPATDIS) for patents, assignees, inventors, places and CPC categories; the USPTO Patent Assignment Dataset (ECORSEXC) for assignments and security interests. Patents filed in the last 20 years. No claims or full text. Links to other records are by name (and state): EXACT means the identical full name and state; FUZZY means a looser name match, with the confidence shown.