US3942702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrugated tubing
Assignee: Boa AG
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Filing: 1974-03-29
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Granted: 1976-03-09
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Expires: 1994-03-29
Abstract
Abstract A method of producing a corrugated flexible tube wherein a corrugated profiled strip having multiple corrugations is wound in a helical path such that its edges overlap and then the overlapped edges are tight welded together, preferably by electrical resistance welding, such that every welded corrugation of the resultant corrugated flexible tube is followed by at least one unwelded corrugation.
Inventors
- 👤 Marco Dreyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:19
CPC Classifications
F; F16; F16L; F16L11/00; F16L11/14; F16L11/16; F16L11/15; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49877
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
83 words
A method of producing a helically corrugated flexible tube which comprises winding a corrugated profiled strip in a helical path such that the edges of said strip overlap and then welding together the overlapped edges, wherein every welded corrugation of the resultant corrugated flexible tube is followed by at least one unwelded corrugation and wherein the corrugations that are welded together have less stiffness than the other corrugations to thereby reduce the stiffness resulting from the overlapping of the edges of said strip.
Claim 2
Independent Claim
83 words
A method of producing a helically corrugated flexible tube which comprises winding a corrugated profiled strip in a helical path such that the edges of said strip overlap and then welding together the overlapped edges, wherein every welded corrugation of the resultant corrugated flexible tube is followed by at least one unwelded corrugation and wherein the corrugations that are welded together have less stiffness than the other corrugations to thereby reduce the stiffness resulting from the overlapping of the edges of said strip.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein the overlapped edges are tight welded by electrical resistance welding.
Claim 4
Dependent Claim
17 words
The method of claim 1, wherein the welded corrugations have the same profile as the unwelded corrugations.
Claim 5
Dependent Claim
17 words
The method of claim 1 wherein the corrugated flexible tube has a wall consisting of several plies.
Claim 6
Dependent Claim
70 words
As an article of manufacture, a helically corrugated flexible tube comprising a corrugated and helically wound strip having the edges of said strip overlapped and welded together wherein every welded corrugation thereof is followed by at least one unwelded corrugation and wherein the corrugations that are welded together have less stiffness than the other corrugations to thereby reduce the stiffness resulting from the overlapping of the edges of said strip.
Claim 7
Dependent Claim
70 words
As an article of manufacture, a helically corrugated flexible tube comprising a corrugated and helically wound strip having the edges of said strip overlapped and welded together wherein every welded corrugation thereof is followed by at least one unwelded corrugation and wherein the corrugations that are welded together have less stiffness than the other corrugations to thereby reduce the stiffness resulting from the overlapping of the edges of said strip.
Claim 8
Dependent Claim
17 words
The article of claim 5 wherein the welded corrugations have the same profile as the unwelded corrugations.
Claim 9
Dependent Claim
17 words
The article of claim 5 wherein the corrugated flexible tube has a wall consisting of several plies.
Claim 10
Dependent Claim
23 words
The article of claim 5 wherein said strip has multiple corrugations and every welded corrugation is followed by at least two unwelded corrugations.
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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) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |