US3896205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making tubular fluidic resistors
Assignee: Johnson Service Co
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Filing: 1970-06-01
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Granted: 1975-07-22
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Expires: 1990-06-01
Abstract
Abstract A capillary linear fluidic resistor is formed by molding a plastic about a close tolerance wire to define a particular length-to-diameter ratio. The wire is shaped to the desired capillary passageway and supported in a mold with walls of the mold engaging the wire at the opposite ends of the capillary passageway. Thus, the wire is a close tolerance member having a given constant diameter. A thermoplastic fills the mold to form spaced beads thereon and after curing, the molded member with the wire therein is removed. The close tolerance wire with the spaced beads molded thereon is placed in a second mold with the wall of the mold engaging the beads. A thermoplastic which does not adhere to either the thermoplastic of the beads or the wire is then injected about the wire to form the body of the fluidic resistor. After curing, the bead, wire, and thermoplastic body are removed from the mold and the wire is pulled from the plastic member to form the capillary resistor.
Inventors
- 👤 David C Broker
- 👤 Judith L Wisniewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:13
CPC Classifications
F; F15; F15C; F15C1/00; F15C1/02; B; B29; B29C; B29C33/00; B29C33/0033; B29C33/12; B29C33/123; B29C39/00; B29C39/02; B29C39/021; B29C39/10; F15C5/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
216 words
A METHOD OF FORMING A LINEAR FLUIDIC CAPILLARY MEMBER DEFINING A CAPILLARY PASSAGEWAY HAVING A PREDETERMINED AND ACCURATE LENGTH AND DIAMETER FOR INSERTION OF AN ACCURATE LINEAR FLOW RISISTANCE IN A FLUIDIC CIRCUIT, COMPRISING FORMING OF A CAVITY MOLD HAVING A CAVITY WALL WITH A PAIR OF SPACED LOCATIONS CORRESPONDING TO THE OPPOSITE ENDS OF THE CAPILLARY PASSAGEWAY, FORMING A ROD MEMBER AS A RECTILINEAR MEMBER HAVING A LENGTH IN EXCESS OF THE LENGTH OF SAID CAPILLARY PASSAGEWAY, RELEASABLY ATTACHING BEAD MEMBERS SPCED IN ACCORDANCE WITH THE LENGTH OF SAID CAPILLARY PASSAGEWAYS, INSERTING SAID ROD MEMBER WITH SAID BEAM MEMBERS WITHIN THE MOLD CAVITY WITH THE ROD SHAPED IN ACCORDANCE WITH SAID CAPILLARY PASSAGEWAY, AND WITH THE ROD MEMBER ENGAGING THE CAVITY WALL AT SAID PAIR OF SPACED LOCATIONS IN ACCORDANCE WITH THE OPPOSITE ENDS OF THE CAPILLARY PASSAGEWAY, FILLING THE MOL CAVITY WITH A MOLDING MATERIAL TO ENCLOSE THE ROD MEMBER EXCEPT AT SAID CAVITY WALLS, SAID ROD MEMBER AND SAID MOLDING MATERIAL BEING SELECTED OF NON-ADHERING MEDIUMS AND SAID ROD MEMBER HAVING A RIGID AND SMOOTH OUTER PRIPHERAL SURFACE, PULLING ONE END OF SAID ROD MEMBER AND THEREBY REMOVING SAID ROD MEMBER TO DIRECTLY DEFINE A CAPILLARY PASSAGEWAY, AND REMOVING SAID BEAD MEMBES FROM THE MOLDED MEMBER TO EXPOSE THE ENDS OF THE PASSAGEWAYS.
Claim 2
Independent Claim
216 words
A METHOD OF FORMING A LINEAR FLUIDIC CAPILLARY MEMBER DEFINING A CAPILLARY PASSAGEWAY HAVING A PREDETERMINED AND ACCURATE LENGTH AND DIAMETER FOR INSERTION OF AN ACCURATE LINEAR FLOW RISISTANCE IN A FLUIDIC CIRCUIT, COMPRISING FORMING OF A CAVITY MOLD HAVING A CAVITY WALL WITH A PAIR OF SPACED LOCATIONS CORRESPONDING TO THE OPPOSITE ENDS OF THE CAPILLARY PASSAGEWAY, FORMING A ROD MEMBER AS A RECTILINEAR MEMBER HAVING A LENGTH IN EXCESS OF THE LENGTH OF SAID CAPILLARY PASSAGEWAY, RELEASABLY ATTACHING BEAD MEMBERS SPCED IN ACCORDANCE WITH THE LENGTH OF SAID CAPILLARY PASSAGEWAYS, INSERTING SAID ROD MEMBER WITH SAID BEAM MEMBERS WITHIN THE MOLD CAVITY WITH THE ROD SHAPED IN ACCORDANCE WITH SAID CAPILLARY PASSAGEWAY, AND WITH THE ROD MEMBER ENGAGING THE CAVITY WALL AT SAID PAIR OF SPACED LOCATIONS IN ACCORDANCE WITH THE OPPOSITE ENDS OF THE CAPILLARY PASSAGEWAY, FILLING THE MOL CAVITY WITH A MOLDING MATERIAL TO ENCLOSE THE ROD MEMBER EXCEPT AT SAID CAVITY WALLS, SAID ROD MEMBER AND SAID MOLDING MATERIAL BEING SELECTED OF NON-ADHERING MEDIUMS AND SAID ROD MEMBER HAVING A RIGID AND SMOOTH OUTER PRIPHERAL SURFACE, PULLING ONE END OF SAID ROD MEMBER AND THEREBY REMOVING SAID ROD MEMBER TO DIRECTLY DEFINE A CAPILLARY PASSAGEWAY, AND REMOVING SAID BEAD MEMBES FROM THE MOLDED MEMBER TO EXPOSE THE ENDS OF THE PASSAGEWAYS.
Claim 3
Dependent Claim
58 words
The method of forming a linear fluidic capillary member in accordance with claim 1, wherein the attaching of said bead members includes the step of mounting the rod member within a mold having bead cavities spaced in accordance with the length of said capillary passageway, and molding said bead members by filling said cavities with a mold material.
Claim 4
Dependent Claim
51 words
The method of claim 1, wherein said bead members have an outer configuration corresponding to the interior configuration of a connecting wall portion at the end of the capillary passageway, supporting said rod member within said mold cavity by a clamping recess means gripping the outer portions of the bead members.
Claim 5
Dependent Claim
54 words
The method of claim 1, including the step of forming said bead members on the ends of the rod member with an outer configuration corresponding to the interior configuration of a connecting wall portion at the end of the capillary passageway, said mold cavity including a connector wall portion aligned with the bead members.
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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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |