US3913207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making sealed tubes
Assignee: Individual
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Filing: 1974-04-16
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Granted: 1975-10-21
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Expires: 1994-04-16
Abstract
Abstract A tube is made for installation in a system wherein the tube is to confine a fluid and to protect it from pollution. Promptly upon the making of the tube, both of its end portions are sealed by swaging them closed. Thereafter, the tube has two circumferential grooves formed on its outer surface, each inwardly adjacent one of the sealed end portions. Promptly before the installation of the tube in a system wherein it is to confine and protect a fluid, the sealed end portions are broken off at said grooves by twisting these portions with reference to the remainder of the tube.
Inventors
- 👤 Roberto Jose Frey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:31
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/10; B; B23; B23P; B23P15/00; B23P15/26; B23P17/00; F25; F25B; F25B41/00; F25B41/30; F25B41/37; Y; Y10; Y10S; Y10S65/00; Y10S65/09; Y10T; Y10T137/00; Y10T137/9247; Y10T29/00; Y10T29/49; Y10T29/49789; Y10T29/4979; Y10T29/49792
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
153 words
A method of making hermetically sealed capillary tubes for installation in fluid systems, particularly refrigeration systems requiring pollution-free plumbing, comprising the steps of making a seamless capillary tube having an outer and an inner circumferential surface, an axis, and opposite end portions, said inner circumferential surface being free of pollutants; immediately sealing said end portions by shaping a longitudinal section thereof into a widened section so that opposite inner circumferential surface portions located on opposite sides of said axis are brought into direct contact with one another, thereby hermetically sealing the interior of said pollution-free tube; scoring said outer circumferential surface of said tube with two circumferential grooves, each of said grooves being inwardly adjacent a respective one of said end portions; and removing said sealed end portions by breaking the latter off at said grooves from the remainder of said tube immediately prior to installation of said tube in the fluid system.
Claim 2
Independent Claim
153 words
A method of making hermetically sealed capillary tubes for installation in fluid systems, particularly refrigeration systems requiring pollution-free plumbing, comprising the steps of making a seamless capillary tube having an outer and an inner circumferential surface, an axis, and opposite end portions, said inner circumferential surface being free of pollutants; immediately sealing said end portions by shaping a longitudinal section thereof into a widened section so that opposite inner circumferential surface portions located on opposite sides of said axis are brought into direct contact with one another, thereby hermetically sealing the interior of said pollution-free tube; scoring said outer circumferential surface of said tube with two circumferential grooves, each of said grooves being inwardly adjacent a respective one of said end portions; and removing said sealed end portions by breaking the latter off at said grooves from the remainder of said tube immediately prior to installation of said tube in the fluid system.
Claim 3
Dependent Claim
23 words
A method as defined in claim 1, wherein said step of sealing is performed by swaging said outer circumferential surface of said tube.
Claim 4
Dependent Claim
22 words
A method as defined in claim 2, wherein said step of swaging is performed prior to said step of scoring said grooves.
Claim 5
Dependent Claim
34 words
A method as defined in claim 1 wherein said step of scoring said grooves includes cutting deeply into said outer surface but leaving a thin peripheral section of the tube surrounded by each groove.
Claim 6
Dependent Claim
27 words
A method as defined in claim 6 wherein said step of removing said end portions is performed by twisting them off from the remainder of the tube.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |