US3768523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ducting
Assignee: Individual
•
Filing: 1971-06-09
•
Granted: 1973-10-30
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Expires: 1991-06-09
Abstract
Abstract Ducting is disclosed having an inner composite of fine fibrous insulating material and a composite of textile fibrous material secured about the inner composite. A fluid-impermeable sleeve may be positioned about the composite of textile fibers.
Inventors
- 👤 C Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:14
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/14; F16L59/147; F16L59/02; F16L59/027
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
100 words
Ducting for the conducting of air, comprising a unitary fibrous cylinder of an inner composite of bonded fine fibrous material of relatively short fibers from three to about seven microns in diameter and a composite of textile fibrous material of long, substantially uniform diameter chopped fibers bonded about said inner composite, and a fluid-impermeable flexible sleeve positioned about said fibrous cylinder, said inner composite providing thermal and acoustical insulation properties to said ducting and a comparatively smooth interior surface to facilitate air flow through said ducting, and said composite of textile fibrous material providing a tough, resilient damage resistant surface.
Claim 2
Dependent Claim
100 words
Ducting for the conducting of air, comprising a unitary fibrous cylinder of an inner composite of bonded fine fibrous material of relatively short fibers from three to about seven microns in diameter and a composite of textile fibrous material of long, substantially uniform diameter chopped fibers bonded about said inner composite, and a fluid-impermeable flexible sleeve positioned about said fibrous cylinder, said inner composite providing thermal and acoustical insulation properties to said ducting and a comparatively smooth interior surface to facilitate air flow through said ducting, and said composite of textile fibrous material providing a tough, resilient damage resistant surface.
Claim 3
Dependent Claim
23 words
The ducting of claim 1 in which and said textile fiber composite comprises chopped fibers of up to approximately four inches in length.
Claim 4
Dependent Claim
18 words
The ducting of claim 2 in which said inner and textile composites are of approximately equal wall thickness.
Claim 5
Dependent Claim
41 words
The ducting of claim 2 in which the thickness of said inner composite and said composite of textile fibrous insulating material are within the range of from about 10 to about 90 percent of the toTal wall thickness of said ducting.
Claim 6
Dependent Claim
112 words
Ducting for the conducting of air, comprising a unitary fibrous cylinder of an inner composite of bonded fine fibrous material of relatively short fibres of up to about seven microns in diameter, a layer of metal foil positioned about said inner composite and adhered thereto, and a composite of textile fibrous material of relatively long, substantially uniform diameter chopped fibres bonded about said layer of metal foil and said inner composite, said inner composite providing thermal and acoustical insulation for said ducting and a comparatively smooth interior surface to facilitate air flow through said ducting, and said composite of textile fibrous material providing a tough, resilient damage resistant surface for said ducting.
Claim 7
Dependent Claim
112 words
Ducting for the conducting of air, comprising a unitary fibrous cylinder of an inner composite of bonded fine fibrous material of relatively short fibres of up to about seven microns in diameter, a layer of metal foil positioned about said inner composite and adhered thereto, and a composite of textile fibrous material of relatively long, substantially uniform diameter chopped fibres bonded about said layer of metal foil and said inner composite, said inner composite providing thermal and acoustical insulation for said ducting and a comparatively smooth interior surface to facilitate air flow through said ducting, and said composite of textile fibrous material providing a tough, resilient damage resistant surface for said ducting.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |