US3835891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible hose
Assignee: Compoflex Co Ltd
•
Filing: 1971-05-20
•
Granted: 1974-09-17
•
Expires: 1991-05-20
Abstract
Abstract The invention relates to a hose or tube which has an inner lining which consists of an inner helical wire with at least one layer of fluorinated ethylene propylene copolymer superposed thereon. The inner wire is preferably coated with fluorinated ethylene propylene copolymer of polytetrafluoroethylene. For the conveyance of chemicals layers of polypropylene fabric and polypropylene film are laid on the copolymer and for the conveyance of high temperature substances asbestos cloth and polypropylene fabric. The whole is encased in an outer cover coated with PVC and surrounded by wire.
Inventors
- 👤 J White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:55
CPC Classifications
F; F16; F16L; F16L11/00; F16L11/04; F16L11/11; F16L11/115; Y; Y10; Y10S; Y10S138/00; Y10S138/03
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
27 words
A hose or tube as in claim 1 wherein said outer wire is formed of a material selected from the group consisting of stainless steel and plastic.
Claim 2
Dependent Claim
29 words
A hose or tube as in claim 2 wherein said outer wire is coated with a material selected from the group consisting of fluorinated ethylene propylene copolymer and polytetrafluoroethylene.
Claim 3
Dependent Claim
17 words
A hose or tube as in claim 1 wherein said inner wire is constructed of stainless steel.
Claim 4
Dependent Claim
121 words
A hose or tube consisting essentially of an inner helical wire coated with a material selected from the group consisting of fluorinated ethylene propylene copolymer and polytetrafluoroethylene, at least one layer of lay-flat tubing made of fluorinated ethylene propylene copolymer superposed on said wire, at least one layer of polypropylene fabric laid on said fluorinated ethylene propylene copolymer tubing, at least one layer of polypropylene lay-flat film laid on said fabric, an outer cover made of a layer of polypropylene fabric coated with polyvinyl chloride, and an outer helical wire wound on said outer cover and displaced half a pitch from the windings of said inner wire so that said outer wire lies midway between the turns of the inner wire.
Claim 5
Dependent Claim
27 words
A hose or tube as in claim 5 wherein said outer wire is formed of a material selected from the group consisting of stainless steel and plastic.
Claim 6
Dependent Claim
29 words
A hose or tube as in claim 6 wherein said outer wire is coated with a material selected from the group consisting of fluorinated ethylene propylene copolymer and polytetrafluoroethylene.
Claim 7
Dependent Claim
17 words
A hose or tube as in claim 5 wherein said inner wire is constructed of stainless steel.
References Cited (Backward Citations)
GB473008A
Cited
GB588858A
Cited
GB591560A
Cited
GB591307A
Cited
GB627054A
Cited
US2647296A
Cited
US2943644A
Cited
US3205913A
Cited
US3279502A
Cited
US3599677A
Cited
US3500870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |