Patent US3918626A successfully refreshed from Google Patents.
US3918626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating patterned tubing from metallic strip
Assignee: Olin Corp
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Filing: 1973-05-10
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Granted: 1975-11-11
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Expires: 1993-05-10
Abstract
Abstract A method of fabricating tubing having formed patterns in or upon the tubing wall where the formed pattern is interrupted by contiguous wall sections or segments which are free of said formed pattern facilitating the manufacture of discrete tube lengths having smooth or patterned wall structure in any desired continuity or configuration.
Inventors
- 👤 Charles D Mclain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:53
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/08; B21C37/083; B21C37/0803; F; F28; F28F; F28F1/00; F28F1/10; F28F1/42; F28F1/424; F28F1/426
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
136 words
A method of continuously fabricating metallic tubing having formed patterns on the tubing wall comprising the steps of: providing a strip of metal of predetermined width, indefinite length and side edges; continuously advancing the strip; continuously forming patterns on at least one surface of the strip during the course of advance; intermittently interrupting the pattern forming step to break the continuity of the formed pattern and to create intervening smooth segments in said surface transverse to the strip length, each segment being a discontinuity in the pattern across the width of the strip; continuously forming said strip into a tube by abutting the side edges to create a longitudinal, axially extending, continuous seam; continuously welding said seam to create a fluid-tight seal; and thereafter transversely cutting the tubing within smooth segments thereof into discrete tube lengths.
Claim 2
Independent Claim
136 words
A method of continuously fabricating metallic tubing having formed patterns on the tubing wall comprising the steps of: providing a strip of metal of predetermined width, indefinite length and side edges; continuously advancing the strip; continuously forming patterns on at least one surface of the strip during the course of advance; intermittently interrupting the pattern forming step to break the continuity of the formed pattern and to create intervening smooth segments in said surface transverse to the strip length, each segment being a discontinuity in the pattern across the width of the strip; continuously forming said strip into a tube by abutting the side edges to create a longitudinal, axially extending, continuous seam; continuously welding said seam to create a fluid-tight seal; and thereafter transversely cutting the tubing within smooth segments thereof into discrete tube lengths.
Claim 3
Dependent Claim
23 words
The method of fabricating tubing according to claim 1 in which the tube cutting step occurs within segments having a smooth internal surface.
Claim 4
Dependent Claim
22 words
The method of fabricating tubing according to claim 1 in which the pattern forming step occurs on opposite surfaces of the strip.
Claim 5
Dependent Claim
47 words
The method of fabricating tubing according to claim 1 in which the pattern forming step occurs on opposite surfaces of the strip simultaneously and the interruption step is timed so that the pattern discontinuity on one surface is phased with the corresponding discontinuity on the second surface.
Claim 6
Dependent Claim
49 words
The method of fabricating tubing according to claim 1 in which the pattern forming step occurs on opposite surfaces of the strip simultaneously and the interruption step is timed so that the pattern discontinuity on one surface is displaced with respect to the corresponding discontinuity on the second surface.
Claim 7
Dependent Claim
33 words
The method of claim 1 wherein the intermittent interruption of the pattern forming step to break continuity of the formed pattern is accomplished by shifting from one pattern configuration to another pattern configuration.
Claim 8
Dependent Claim
17 words
A method according to claim 1 in which the pattern forming step comprises forming longitudinally extending corrugations.
Claim 9
Dependent Claim
20 words
A method according to claim 1 in which the tube cutting step occurs within segments having a smooth external surface.
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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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |