Patent US3738775A successfully refreshed from Google Patents.
US3738775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant pressure liquid supply system
Assignee: United States Department of the Navy
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Filing: 1971-10-07
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Granted: 1973-06-12
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Expires: 1991-10-07
Abstract
Abstract A constant pressure liquid supply system including a tank having an inlet; a pump which has an inlet for receiving fluid and an outlet which is connected to the tank inlet; switch means connected to the pump for turning the pump on and off; and means responsive to fluid pressure within the tank and cooperable with the switch means for turning the pump on when the tank fluid pressure falls below a predetermined level and turning the pump off when the tank fluid pressure attains said predetermined level. A bladder for containing liquid may be mounted in the tank and may have an outlet which extends therefrom for discharging the liquid when squeezed down by fluid pressure within the tank.
Inventors
- 👤 A Strickland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:07
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/08; F04B43/10; B; B65; B65D; B65D88/00; B65D88/54; B65D88/58; B65D88/60; B65D88/62; F04B49/00; F04B49/02; F04B49/022; F15; F15B; F15B1/00; F15B1/02; F15B1/027; F15B1/033
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
161 words
A constant pressure liquid supply system comprising: a tank having an inlet; a pump having an inlet for receiving fluid and an outlet which is connected to the tank inlet; switch means connected to the pump for turning the pump on and off; means responsive to fluid pressure within the tank and cooperable with the switch means for turning the pump on when the tank fluid pressure falls below a predetermined level and turning the pump off when the tank fluid pressure attains said predetermined level; a bladder mounted in the tank and capable of containing liquid; said bladder having an outlet extending from the tank for discharging the liquid when squeezed down by fluid pressure within the tank; said tank having a retainer plate which seals the tank and is removable therefrom; said bladder being elongated and having a rigid end plate mounted at each end thereof; and each of the bladder end plate being mounted to the retainer plate.
Claim 2
Dependent Claim
161 words
A constant pressure liquid supply system comprising: a tank having an inlet; a pump having an inlet for receiving fluid and an outlet which is connected to the tank inlet; switch means connected to the pump for turning the pump on and off; means responsive to fluid pressure within the tank and cooperable with the switch means for turning the pump on when the tank fluid pressure falls below a predetermined level and turning the pump off when the tank fluid pressure attains said predetermined level; a bladder mounted in the tank and capable of containing liquid; said bladder having an outlet extending from the tank for discharging the liquid when squeezed down by fluid pressure within the tank; said tank having a retainer plate which seals the tank and is removable therefrom; said bladder being elongated and having a rigid end plate mounted at each end thereof; and each of the bladder end plate being mounted to the retainer plate.
Claim 3
Dependent Claim
21 words
A system as claimed in claim 1 including: said tank having a fluid vent hole and a removable plug disposed therein.
Claim 4
Dependent Claim
33 words
A system as claimed in claim 2 including: a quick disconnect fitting mounted to said one of the bladder end plates serving as the bladder outlet, and extending through the tank''s retainer plate.
Claim 5
Dependent Claim
43 words
A system as claimed in claim 3 including: means mounted to the other bladder end plate for engaging an inside wall of the tank and relieving the weight of the bladder and other end plate when such weights are directed toward said wall.
Claim 6
Dependent Claim
76 words
A system as claimed in claim 4 including: the fluid pressure responsive means being an accumulator which includes a spring biased piston and rod within a cylinder; the outlet of the pump also being connected to the accumulator for applying pressure against said piston; said switch means being a push button switch; and said rod extending from the cylinder and being engageable with the push button of the switch for turning the pump on and off.
Claim 7
Dependent Claim
24 words
A system as claimed in claim 5 including: a check valve connected between the pump and the tank, and the pump and the accumulator.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |