US4009734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coiled tubing
Assignee: Parker Hannifin Corp
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Filing: 1976-02-26
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Granted: 1977-03-01
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Expires: 1996-02-26
Abstract
Abstract A flexible self-retracting coiled tubing having desirable recoil strength and elastic memory is described. The coiled tubing is adaptable especially as a self-retracting air tube for transmitting fluids under pressure to pneumatic equipment. The coiled tubing comprises an extruded seamless plastic tube prepared by extruding a mixture comprising a chemically extended polyester and from about 10% to about 50% of a polybutylene terephthalate polymer.
Inventors
- 👤 Dennis W. Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:23
CPC Classifications
F; F16; F16L; F16L11/00; F16L11/04; F16L11/12; B; B29; B29C; B29C53/00; B29C53/02; B29C53/12; F16L11/06; F16L11/08; F16L11/085; B29L; B29L2023/00; B29L2023/005; Y; Y10; Y10S; Y10S138/00; Y10S138/07
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
36 words
A self-retracting flexible coiled tubing structure to transmit fluids under pressure comprising an extruded seamless tube of a mixture of a chemically extended polyester and from about 10% to about 50% of a polybutylene terephthalate polymer.
Claim 2
Dependent Claim
36 words
A self-retracting flexible coiled tubing structure to transmit fluids under pressure comprising an extruded seamless tube of a mixture of a chemically extended polyester and from about 10% to about 50% of a polybutylene terephthalate polymer.
Claim 3
Dependent Claim
30 words
The coiled tubing structure of claim 1 wherein the tube comprises a mixture of a chemically extended polyester and from about 10% to about 25% of a polybutylene terephthalate polymer.
Claim 4
Dependent Claim
46 words
The coiled tubing structure of claim 1 wherein the chemically extended polyester is a polyester obtained by the polymerization of a mixture of a long-chain glycol, one or more dicarboxylic acids or their esters or ester-forming derivatives, and one or more low molecular weight aliphatic diols.
Claim 5
Dependent Claim
42 words
The coiled tubing of claim 1 wherein the wall thickness of the tube is within the range of about 0.01 to about 0.10 inch and the inside diameter of the tubing is within the range of about 0.2 to about one inch.
Claim 6
Dependent Claim
16 words
The tubing structure of claim 1 wherein there is also a stranded reinforcement over the tube.
Claim 7
Dependent Claim
17 words
The tubing structure of claim 5 wherein there is a sheath of plastic material over the reinforcement.
Claim 8
Dependent Claim
45 words
A self-retracting flexible hollow coiled tubing adapted to transmit fluids under high pressure comprising a seamless plastic tube comprising a mixture of a chemically extended polyester with a durometer D hardness of about 63 and from about 10 to 25% of a polybutylene terephthalate polymer.
Claim 9
Dependent Claim
45 words
A self-retracting flexible hollow coiled tubing adapted to transmit fluids under high pressure comprising a seamless plastic tube comprising a mixture of a chemically extended polyester with a durometer D hardness of about 63 and from about 10 to 25% of a polybutylene terephthalate polymer.
Claim 10
Dependent Claim
38 words
The coiled tube of claim 7 wherein the polybutylene terephthalate polymer has a specific gravity of about 1.31 g/cc at 73° F., a specific volume of about 21 cubic inch/lb. and a tensile strength of about 8,000 p.s.i.
References Cited (Backward Citations)
US2939860A
Cited
US3021871A
Cited
US3211473A
Cited
US3245431A
Cited
US3253618A
Cited
US3253619A
Cited
US3581778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |