Patent US4445236A successfully refreshed from Google Patents.
US4445236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Push-through pump
Assignee: Individual
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Filing: 1983-02-07
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Granted: 1984-05-01
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Expires: 2003-02-07
Abstract
Abstract This invention appertains to plumber's tools for unplugging stoppages in pipes or stacks and comprises a vacuum cup at one end of a handle and a reversible selectively operable pump which is mounted to operate through the cup. The parts of the mechanism are positionable so that the tool operates as a plunger with a vacuum cup or as a pump.
Inventors
- 👤 Henry Nadolny
- 👤 Henryka A. Nadolna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:02
CPC Classifications
E; E03; E03C; E03C1/00; E03C1/12; E03C1/30; E03C1/304; E03C1/308
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
94 words
A combination pump and plunger for unplugging stoppages in toilets and the like comprising a housing forming a handle portion having a vacuum cup at one end, a pump mounted at said one end of the handle portion within the upper end of the cup, means providing selectively operable openable and closable passage means into said cup and through said pump and out and into said housing for filling and exhausting the pump, and means for reversing said pump, and means for reversing said pump comprising a reversible motor operably connected to the pump.
Claim 2
Dependent Claim
94 words
A combination pump and plunger for unplugging stoppages in toilets and the like comprising a housing forming a handle portion having a vacuum cup at one end, a pump mounted at said one end of the handle portion within the upper end of the cup, means providing selectively operable openable and closable passage means into said cup and through said pump and out and into said housing for filling and exhausting the pump, and means for reversing said pump, and means for reversing said pump comprising a reversible motor operably connected to the pump.
Claim 3
Dependent Claim
32 words
The invention according to claim 1 and said pump comprising a rotor and an enclosing casing, and means providing a mounting for the cup and for said means providing said passage means.
Claim 4
Dependent Claim
15 words
The invention according to claim 2 and valve means operably associated with said passage means.
Claim 5
Dependent Claim
29 words
The invention according to claim 2 and said motor mounted on the other end of said handle, and drive means within said handle connecting said motor with said rotor.
Claim 6
Dependent Claim
40 words
The invention according to claim 1 and said pump comprising a rotor mounted at the base of the cup, and said means providing the openable and closable passage means comprising a valve assembly interposed between the pump and the cup.
Claim 7
Dependent Claim
39 words
The invention according to claim 5 and said housing having a sleeve like portion above the rotor with passages therethrough for passing fluid from outside the housing into the pump and for exhausting the fluid out of the housing.
References Cited (Backward Citations)
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US3934280A
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US4053955A
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US4097937A
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US4174548A
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US4186451A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |