US3911962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire-resistant flexible tubes
Assignee: Rhone Poulenc SA
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Filing: 1973-05-18
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Granted: 1975-10-14
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Expires: 1993-05-18
Abstract
Abstract A fire-resistant flexible tube, for example for conducting air to heat or air condition the interior of a vehicle, aircraft etc. The tube comprises at least one fabric woven from fibres of glass, polyimide-amide or polyimide, and a rigid supporting helix glued to the or each fabric, the helix being formed from a circular hollow braid of glass fibres, the braid having an external diameter of 0.8 to 1.8 mm, with or without a solid core of mineral fibres, the helix being stiffened by 5 to 35% by weight of a heat resistant resin of organo-silicon or polyamide.
Inventors
- 👤 Max Chomat
- 👤 Jacques Proriol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:57
CPC Classifications
F; F16; F16L; F16L11/00; F16L11/04; F16L11/11; F16L11/118; F16L11/12; F16L11/125; F16L57/00; F16L57/04; Y; Y10; Y10S; Y10S138/00; Y10S138/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
70 words
A LIGHTWEIGHT FIRE-RESISTANT FLEXIBLE TUBE COMPRISING AT LEAST ONE FABRIC WOVEN FROM FIBERS OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF GLASS, A RIGID SUPPORTING HELIX GLUED TO SAID FABRIC, THE RIGID HELIX BEING FORMED FROM A CIRCULAR HOLLOW BRAID OF GLASS FIBRES, THE BRAID HAVING AN EXTERNAL DIAMETER OF 0.8 TO 1.8 MM, AND BEING STIFFENED BY A HEAT-RESISTANT RESIN SELECTED FROM THE GROUP CONSISTING OF ORGANO-SILICONE RESINS
Claim 2
Dependent Claim
70 words
A LIGHTWEIGHT FIRE-RESISTANT FLEXIBLE TUBE COMPRISING AT LEAST ONE FABRIC WOVEN FROM FIBERS OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF GLASS, A RIGID SUPPORTING HELIX GLUED TO SAID FABRIC, THE RIGID HELIX BEING FORMED FROM A CIRCULAR HOLLOW BRAID OF GLASS FIBRES, THE BRAID HAVING AN EXTERNAL DIAMETER OF 0.8 TO 1.8 MM, AND BEING STIFFENED BY A HEAT-RESISTANT RESIN SELECTED FROM THE GROUP CONSISTING OF ORGANO-SILICONE RESINS
Claim 3
Dependent Claim
65 words
A fire-resistant flexible tube as claimed in claim 1, and further comprising a solid core of mineral fibres within the circular hollow braid of said rigid helix, said mineral fibres being stiffened by a heat-resistant resin selected from the group consisting of organo-silicon resins and polyimide resins, the weight of heat resilient resin being from 5 to 35% of the weight of said mineral fibres.
Claim 4
Dependent Claim
35 words
A fire-resistant flexible tube as claimed in claim 1, comprising two woven fabrics, wherein one of said woven fabrics is surrounded by said rigid helix and the other of said woven fabrics surrounds said helix.
Claim 5
Dependent Claim
24 words
A fire-resistant flexible tube as claimed in claim 1, comprising a single woven fabric, wherein said woven fabric is surrounded by said supporting helix.
Claim 6
Dependent Claim
24 words
A fire-resistant flexible tube as claimed in claim 1, wherein the spacing between successive turns of the helix is between 2 and 8 mm.
Claim 7
Dependent Claim
130 words
A lightweight fire-resistant flexible tube comprising: a first fabric woven from fibres of a material selected from the group consisting of glass, said fabric being formed into a tube, a rigid supporting helix glued about the external periphery of said first fabric, and a second fabric woven from fibres of a material selected from the group consisting of glass glued to said supporting helix and surrounding said helix and said first fabric, the rigid helix being formed from a circular hollow braid of glass fibres, the braid having an external diameter of 0.8 to 1.8 mm, and being stiffened by a heat-resistant resin selected from the group consisting of organo-silicone resins and polyimide resins; the weight of heat-resistant resin being from 10 to 20% of the weight of the braid.
Claim 8
Dependent Claim
130 words
A lightweight fire-resistant flexible tube comprising: a first fabric woven from fibres of a material selected from the group consisting of glass, said fabric being formed into a tube, a rigid supporting helix glued about the external periphery of said first fabric, and a second fabric woven from fibres of a material selected from the group consisting of glass glued to said supporting helix and surrounding said helix and said first fabric, the rigid helix being formed from a circular hollow braid of glass fibres, the braid having an external diameter of 0.8 to 1.8 mm, and being stiffened by a heat-resistant resin selected from the group consisting of organo-silicone resins and polyimide resins; the weight of heat-resistant resin being from 10 to 20% of the weight of the braid.
Claim 9
Dependent Claim
138 words
A lightweight fire-resistant flexible tube comprising a first fabric woven from fibres of a material selected from the group consisting of glass, said fabric being formed into a tube, a rigid supporting helix glued about the external periphery of said first fabric, and a second fabric woven from fibres of a material selected from the group consisting of glass glued to said supporting helix and surrounding said first fabric and said supporting helix, said rigid helix being formed from a circular hollow braid of glass fibres, said braid having an external diameter of 0.8 to 1.8 mm, said braid being stiffened before being glued tO said fabric by a heat-resistant resin selected from the group consisting of organo-silicone resins and polyimide resins, the weight of heat-resistant resin being from 10 to 20% of the weight of the braid.
Claim 10
Dependent Claim
138 words
A lightweight fire-resistant flexible tube comprising a first fabric woven from fibres of a material selected from the group consisting of glass, said fabric being formed into a tube, a rigid supporting helix glued about the external periphery of said first fabric, and a second fabric woven from fibres of a material selected from the group consisting of glass glued to said supporting helix and surrounding said first fabric and said supporting helix, said rigid helix being formed from a circular hollow braid of glass fibres, said braid having an external diameter of 0.8 to 1.8 mm, said braid being stiffened before being glued tO said fabric by a heat-resistant resin selected from the group consisting of organo-silicone resins and polyimide resins, the weight of heat-resistant resin being from 10 to 20% of the weight of the braid.
Claim 11
Dependent Claim
146 words
A lightweight fire-resistant flexible tube comprising a first fabric woven from fibres of a material selected from the group consisting of glass, said fabric being formed into a tube, a rigid supporting helix glued to the external periphery of said fabric, and a second fabric woven from fibres of a material selected from the group consisting of glass, said fabric being glued to said helix and surrounding said helix and said first fabric, said rigid helix being formed from a circular hollow braid of glass fibres, the braid having an external diameter of 0.8 to 1.8 mm, said braid of glass fibres being initially nonrigid and being stiffened before being glued to said first fabric by a heat-resistant resin selected from the group consisting of organo-silicone resins and polyimide resins, the weight of heat-resistant resin being from 15 to 25% of the weight of the braid.
Claim 12
Dependent Claim
146 words
A lightweight fire-resistant flexible tube comprising a first fabric woven from fibres of a material selected from the group consisting of glass, said fabric being formed into a tube, a rigid supporting helix glued to the external periphery of said fabric, and a second fabric woven from fibres of a material selected from the group consisting of glass, said fabric being glued to said helix and surrounding said helix and said first fabric, said rigid helix being formed from a circular hollow braid of glass fibres, the braid having an external diameter of 0.8 to 1.8 mm, said braid of glass fibres being initially nonrigid and being stiffened before being glued to said first fabric by a heat-resistant resin selected from the group consisting of organo-silicone resins and polyimide resins, the weight of heat-resistant resin being from 15 to 25% of the weight of the braid.
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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) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |