US3860043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duct
Assignee: Automation Industries Inc
•
Filing: 1972-12-07
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Granted: 1975-01-14
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Expires: 1992-12-07
Abstract
Abstract An extremely light-weight, semi-rigid waste drain duct is disclosed. The duct is particularly adapted for use in toilet drain systems and the like and includes a semi-rigid laminate duct structure with a ply which is non-porous barrier sandwiched between a pair of fiberglass reinforced plies. In addition, a smooth-seamless and water repellent gel-coat innermost ply is provided. Sections of the duct have flexible receptacle cuff and rigid plug end portions adapted to mate with opposite portions of other such sections. Multiple-ply bands or stiffeners may be disposed along the duct to prevent collapse under negative pressure, the stiffeners being spaced according to the shape and length of the duct.
Inventors
- 👤 Thomas A Kutnyak
- 👤 Robert Trelease
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:05
CPC Classifications
F; F16; F16L; F16L43/00; F16L43/008; E; E03; E03C; E03C1/00; E03C1/12; E03C1/122; F16L11/00; F16L11/04; F16L11/11; F16L11/115; F16L47/00; F16L47/26; F16L47/32
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
Light-weight, semi-rigid waste drain duct for use in toilet drain systems and the like, as in aircraft, the duct including the combination of: first and second reinforcing fiberglass plies impregnated with polyester resin in concentric relation to each other forming a unitary portion of said duct; a non-porous self-extinguishing thermoplastic film disposed between said first and second reinforcing plies preventing liquids from penetrating through the wall of said duct; a smooth, seamless and water-repellent plastic gel-coat permanently bonded to the inner wall of the innermost of said reinforcing plies, and a plurality of spaced reinforcing bands integral with the duct, said bands being formed of fiberglass.
Claim 2
Dependent Claim
106 words
Light-weight, semi-rigid waste drain duct for use in toilet drain systems and the like, as in aircraft, the duct including the combination of: first and second reinforcing fiberglass plies impregnated with polyester resin in concentric relation to each other forming a unitary portion of said duct; a non-porous self-extinguishing thermoplastic film disposed between said first and second reinforcing plies preventing liquids from penetrating through the wall of said duct; a smooth, seamless and water-repellent plastic gel-coat permanently bonded to the inner wall of the innermost of said reinforcing plies, and a plurality of spaced reinforcing bands integral with the duct, said bands being formed of fiberglass.
Claim 3
Dependent Claim
16 words
The duct according to claim 1, wherein said plastic gel-coat is a non-odor absorbing Teflon material.
Claim 4
Dependent Claim
126 words
Light-weight, semi-rigid waste drain duct for use in toilet drain systems and the like, as in aircraft, the duct including the combination of: a semi-rigid laminate duct structure having a preselected weight and including a nonporous barrier inner ply and a barrier ply; reinforcing means including a stacked plurality of fiberglass bands forming spaced external stiffeners integrally disposed circumferentially about and for preventing collapse of said duct structure; said duct structure further including a first fiberglass reinforcing ply disposed between said barrier inner ply and said barrier ply and a second fiberglass reinforcing ply disposed about the outer surface of said barrier ply; the innermost of said reinforcing bands being disposed adjacent said barrier ply and the outermost being disposed immediately below said second reinforcing ply.
Claim 5
Dependent Claim
126 words
Light-weight, semi-rigid waste drain duct for use in toilet drain systems and the like, as in aircraft, the duct including the combination of: a semi-rigid laminate duct structure having a preselected weight and including a nonporous barrier inner ply and a barrier ply; reinforcing means including a stacked plurality of fiberglass bands forming spaced external stiffeners integrally disposed circumferentially about and for preventing collapse of said duct structure; said duct structure further including a first fiberglass reinforcing ply disposed between said barrier inner ply and said barrier ply and a second fiberglass reinforcing ply disposed about the outer surface of said barrier ply; the innermost of said reinforcing bands being disposed adjacent said barrier ply and the outermost being disposed immediately below said second reinforcing ply.
Claim 6
Dependent Claim
27 words
The duct according to claim 3, wherein said duct structure also includes a smooth, seamless and water repellent gel-coat as the inner ply of said duct structure.
Claim 7
Dependent Claim
15 words
The duct according to claim 4, wherein said gel-coat is a non-odor absorbing Teflon material.
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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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |