US3760599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for controlling the flowliquid
Assignee: Individual
•
Filing: 1971-08-02
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Granted: 1973-09-25
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Expires: 1991-08-02
Abstract
Abstract The intermittent flow of carbon dioxide liquid from a high pressure reservoir to a low pressure use area is controlled by a flow restricting orifice disposed in the supply line and a simple control valve located in the line downstream of the orifice. An additional source of pressurized fluid maintains the pressure between the orifice and the valve above the triple point of carbon dioxide to prevent solidification of the carbon dioxide upstream of the valve. In a cyclical blow molding operation wherein liquid carbon dioxide is used to chill the freshly molded parts, the pressure of the fluid used to expand the parison is maintained above the triple point of carbon dioxide to prevent solidification of the carbon dioxide. Additionally, a predetermined amount of carbon dioxide is permitted to vaporize in the line upstream of the orifice during the off cycle in the molding operation thereby providing the necessary time delay between the application of the parison expanding gas and the injection of the liquid carbon dioxide into the molded part.
Inventors
- 👤 R Bose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:54
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/64; B29C49/66; B29C35/00; B29C35/16; B29C2035/1616; B29C2035/1625; B29C2035/165; B29C2035/1658; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2564; Y10T137/2572
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
106 words
A method of metering the flow of liquid carbon dioxide to a use area at which said liquid is permitted to volatize, comprising the steps of providing a supply line between a source of liquid carbon dioxide and said area, providing a continuously open restrictive metering orifice in said supply line to control the flow rate of carbon dioxide to said use area, providing a control valve downstream of said metering orifice, and connecting a source of pressurized gas to said supply line between said metering orifice and said control valve to maintain the pressure at said open orifice above the triple point of carbon dioxide.
Claim 2
Independent Claim
106 words
A method of metering the flow of liquid carbon dioxide to a use area at which said liquid is permitted to volatize, comprising the steps of providing a supply line between a source of liquid carbon dioxide and said area, providing a continuously open restrictive metering orifice in said supply line to control the flow rate of carbon dioxide to said use area, providing a control valve downstream of said metering orifice, and connecting a source of pressurized gas to said supply line between said metering orifice and said control valve to maintain the pressure at said open orifice above the triple point of carbon dioxide.
Claim 3
Dependent Claim
81 words
A method as set forth in claim 1 comprising the further steps of interrupting the flow of carbon dioxide through said orifice to said use area, then vaporizing the carbon dioxide in a predetermined length of said supply line immediately upstream of said open orifice, and thereafter commencing the flow of carbon dioxide through said orifice to said use area, whereby carbon dioxide gas is initially supplied to said use area for a predetermined time interval followed by liquid carbon dioxide.
Claim 4
Dependent Claim
38 words
A method as set forth in claim 1 wherein said liquid carbon dioxide upstream of said orifice is at a pressure several times greater than the pressure of said gas connected to said line downstream of said orifice.
Claim 5
Independent Claim
136 words
A system for controlling the flow of liquid carbon dioxide from a high pressure source wherein said carbon dioxide is maintained in the liquid phase to a low pressure use area where said liquid is permitted to vaporize, comprising a pressurized tank containing said liquid carbon dioxide, a supply line connected between said tank and said area, a continuously open restrictive metering orifice connected in said supply line for controlling the rate of flow of carbon dioxide to said use area, a control valve connected downstream of said metering orifice for controlling the flow of carbon dioxide to said use area, and means separate from said supply line connecting a source of pressurized gas between said metering orifice and said control valve to maintain the pressure at said orifice above the triple point of carbon dioxide.
Claim 6
Independent Claim
136 words
A system for controlling the flow of liquid carbon dioxide from a high pressure source wherein said carbon dioxide is maintained in the liquid phase to a low pressure use area where said liquid is permitted to vaporize, comprising a pressurized tank containing said liquid carbon dioxide, a supply line connected between said tank and said area, a continuously open restrictive metering orifice connected in said supply line for controlling the rate of flow of carbon dioxide to said use area, a control valve connected downstream of said metering orifice for controlling the flow of carbon dioxide to said use area, and means separate from said supply line connecting a source of pressurized gas between said metering orifice and said control valve to maintain the pressure at said orifice above the triple point of carbon dioxide.
Claim 7
Dependent Claim
37 words
A system according to claim 2 wherein said means comprises a line connected from said tank to said location downstream of said orifice, and a pressure reducing valve and a check valve in said last named line.
Claim 8
Dependent Claim
34 words
A system according to claim 4, further comprising vaporizing means connected in said supply line for vaporizing the carbon dioxide in a predetermined length of said supply line immediately upstream of said metering orifice.
Claim 9
Dependent Claim
17 words
A system according to claim 6, wherein said vaporizing means comprises a length of flexible plastic tubing.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |