Patent US3971400A successfully refreshed from Google Patents.
US3971400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable vacuum and pressure liquid tank apparatus
Assignee: Individual
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Filing: 1975-01-24
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Granted: 1976-07-27
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Expires: 1995-01-24
Abstract
Abstract A portable vacuum and pressure liquid tank used primarily for the skimming, removal and transfer of industrial waste liquids. A motor-driven pump supplies either super-atmospheric air pressure or a vacuum to the interior of the tank. When the tank interior is connected to vacuum, waste liquid is drawn into the tank. Pressurizing the interior of the tank forces the waste liquid out of the tank. Filling and draining of the tank may be controlled solely by valves.
Inventors
- 👤 David L. Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:58
CPC Classifications
B; B60; B60P; B60P3/00; B60P3/22; B60P3/224; E; E03; E03F; E03F7/00; E03F7/10; F; F04; F04F; F04F1/00; F04F1/02; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3109
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
269 words
Portable vacuum and pressure liquid tank apparatus comprising: a tank; a power-driven pump adapted to supply either air pressure or a vacuum to the interior of said tank; an inlet conduit through which liquid is admitted to said tank; a discharge conduit through which liquid is discharged from said tank; a bleeder line connecting the atmosphere with the upper interior of said tank; an inlet valve in said inlet conduit having a valve element movable between an open and a closed position; a drain valve in said discharge conduit having a valve element movable between an open and a closed position; first and second bleed valves arranged in series in said bleeder line; first and second levers that actuate said inlet and drain valves respectively; first linkage means interconnecting said first lever and said first bleed valve so that movement of said inlet valve towards an open position will effect movement of said first bleed valve towards an open position; second linkage means interconnecting said second lever and said second bleed valve so that movement of said drain valve towards an open position will effect movement of said second bleed valve towards a closed position; and lost-motion connection means interposed in said first and second linkage means constructed and arranged so that said first and second bleed valves will not be moved towards an open position and closed position, respectively, until after said inlet and drain valves have been moved towards an open and a closed position, respectively, to thereby avoid damage to the valve elements of said inlet and discharge valves by foreign matter entrained in said liquid.
Claim 2
Dependent Claim
269 words
Portable vacuum and pressure liquid tank apparatus comprising: a tank; a power-driven pump adapted to supply either air pressure or a vacuum to the interior of said tank; an inlet conduit through which liquid is admitted to said tank; a discharge conduit through which liquid is discharged from said tank; a bleeder line connecting the atmosphere with the upper interior of said tank; an inlet valve in said inlet conduit having a valve element movable between an open and a closed position; a drain valve in said discharge conduit having a valve element movable between an open and a closed position; first and second bleed valves arranged in series in said bleeder line; first and second levers that actuate said inlet and drain valves respectively; first linkage means interconnecting said first lever and said first bleed valve so that movement of said inlet valve towards an open position will effect movement of said first bleed valve towards an open position; second linkage means interconnecting said second lever and said second bleed valve so that movement of said drain valve towards an open position will effect movement of said second bleed valve towards a closed position; and lost-motion connection means interposed in said first and second linkage means constructed and arranged so that said first and second bleed valves will not be moved towards an open position and closed position, respectively, until after said inlet and drain valves have been moved towards an open and a closed position, respectively, to thereby avoid damage to the valve elements of said inlet and discharge valves by foreign matter entrained in said liquid.
Claim 3
Dependent Claim
40 words
Portable vacuum and pressure liquid tank apparatus as set forth in claim 1 wherein said inlet and drain valves are moved to about one-half their fully-opened and fully-closed positions, respectively, before said bleed valves start moving towards their closed position.
Claim 4
Dependent Claim
30 words
Portable vacuum and pressure liquid tank apparatus as set forth in claim 1 wherein said lost-motion connection means include slots and pins interposed between said levers and said linkage means.
Claim 5
Dependent Claim
45 words
Portable vacuum and pressure liquid tank apparatus as set forth in claim 1 which further includes an air valve interposed between said pump, the interior of said tank and the atmosphere, and actuator means for said air valve that are operated by said second lever.
Claim 6
Dependent Claim
33 words
Portable vacuum and pressure liquid tank apparatus as set forth in claim 1 wherein said first and second levers are positioned adjacent one another in the vicinity of said inlet and drain valves.
Claim 7
Dependent Claim
30 words
Portable vacuum and pressure liquid tank apparatus as set forth in claim 2 wherein said lost-motion connection means include slots and pins interposed between said levers and said linkage means.
Claim 8
Dependent Claim
45 words
Portable vacuum and pressure liquid tank apparatus as set forth in claim 2 which further includes an air valve interposed between said pump, the interior of said tank and the atmosphere, and actuator means for said air valve that are operated by said second lever.
Claim 9
Dependent Claim
33 words
Portable vacuum and pressure liquid tank apparatus as set forth in claim 2 wherein said first and second levers are positioned adjacent one another in the vicinity of said inlet and drain valves.
Claim 10
Dependent Claim
45 words
Portable vacuum and pressure liquid tank apparatus as set forth in claim 3 which further includes an air valve interposed between said pump, the interior of said tank and the atmosphere, and actuator means for said air valve that are operated by said second lever.
Claim 11
Dependent Claim
33 words
Portable vacuum and pressure liquid tank apparatus as set forth in claim 3 wherein said first and second levers are positioned adjacent one another in the vicinity of said inlet and drain valves.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |