US3739815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible collapsible tubing
Assignee: Automation Industries Inc
•
Filing: 1971-04-30
•
Granted: 1973-06-19
•
Expires: 1991-04-30
Abstract
Abstract A flexible strip of elastomeric material, or a fabric strip which is coated with or contains an elastomeric material is wound helically with overlapped edges. A form-giving member of stiff bendable thermoplastic material in rod-like form is laid between the overlapped edges and secured there by self adhesion of the overlapped edges. Then the tubing is heat-treated to heat-set the form-giving helix in its helical form and at the same time cure the strip and to weld the overlapped edges of the strip. The flexible strip is preferably impervious to the passage of gas through it.
Inventors
- 👤 W Rejeski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:57
CPC Classifications
F; F16; F16L; F16L11/00; F16L11/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
30 words
Collapsible tubing as claimed in claim 1 in which the strip material includes synthetic plastic material and the edges of adjacent convolutions are overlapped and welded together by heat treatment.
Claim 2
Dependent Claim
35 words
Collapsible flexible tubing as claimed in claim 2 in which the adjacent edges of adjacent convolutions of the strip material are overlapped, and the convolutions of the helical form-giving member lie between said overlapped edges.
Claim 3
Dependent Claim
35 words
Collapsible flexible tubing as claimed in claim 1 in which the adjacent edges of adjacent convolutions of the strip material are overlapped, and the convolutions of the helical form-giving member lie between said overlapped edges.
Claim 4
Dependent Claim
18 words
Collapsible tubing as claimed in claim 1 in which the helical form-giving member is made of a polyamide.
Claim 5
Dependent Claim
84 words
Two-element flexible tubing comprising a strip of flexible material wound helically with adjacent edges of successive convolutions overlapped and secured together, and a form-giving helix made from a synthetic plastic rod-like member lying between said over-lapped edges, said form-giving member being of thermoplastic material which retains its helical form and resilient condition after heat treatment, said tubing being heat-set to maintain said forming helix in helical form, whereby said rod-like member tends to return to its helical condition after sharp bending, crushing or deformation.
Claim 6
Dependent Claim
30 words
Collapsible tubing as claimed in claim 6 in which the strip material includes synthetic plastic material and the overlapped edges are welded together by the heat treatment of the tubing.
Claim 7
Dependent Claim
17 words
Collapsible tubing as claimed in claim 6 in which the form-giving helix is made from a polyamide.
Claim 8
Dependent Claim
44 words
Collapsible tubing as claimed in claim 6 in which the strip material initially is a woven polyamide fabric coated with uncured plastic material, said coating in the finished tubing having become cured by said heat treatment and said overlapped edges being welded together thereby.
Claim 9
Dependent Claim
44 words
Collapsible tubing as claimed in claim 6 in which the strip material initially is a woven fiber-glass fabric coated with uncured plastic material, said coating in the finished tubing having become cured by said heat treatment and said overlapped edges being welded together thereby.
References Cited (Backward Citations)
US2452047A
Cited
US2486387A
Cited
GB775639A
Cited
US3334663A
Cited
US3323553A
Cited
US3479670A
Cited
US3428093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |