US3835606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination ceiling tile and air duct structure
Assignee: Individual
•
Filing: 1972-05-22
•
Granted: 1974-09-17
•
Expires: 1992-05-22
Abstract
Abstract A heating and air conditioning duct system for installation in drop ceilings utilizing T-bar construction wherein ducts are formed of a suitable insulating light weight material and secured to ceiling tiles to provide the completed duct which can then be placed in position on the T-bars as in the case of conventional ceiling tiles. Bends and reducing sections may also be prefabricated so that the entire air distribution system can be installed in the course of installation of the ceiling and without the need for special sheet metal work which involves considerable time and expense.
Inventors
- 👤 M Liberman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:10
CPC Classifications
E; E04; E04F; E04F17/00; E04F17/04; E04B; E04B9/00; E04B9/02; F; F24; F24F; F24F13/00; F24F13/02; F24F13/0227; F24F13/0263
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
39 words
An air duct for drop ceilings having longitudinal and transverse members for supporting ceiling tiles, a U-shaped channel having outwardly extending legs, a sheet bridging said legs, said channel and sheet being supported by said longitudinal and transverse members.
Claim 2
Dependent Claim
39 words
An air duct for drop ceilings having longitudinal and transverse members for supporting ceiling tiles, a U-shaped channel having outwardly extending legs, a sheet bridging said legs, said channel and sheet being supported by said longitudinal and transverse members.
Claim 3
Dependent Claim
33 words
An air duct for drop ceilings according to claim 1 wherein successive sheet and channel combinations are joined in end-to-end relationship and means are provided for sealing the abutting edges of said combinations.
Claim 4
Dependent Claim
34 words
An air duct for drop ceilings according to claim 1 wherein said channel is formed of a relatively dense plastic insulating material having an aluminum sheet bonded to at least the inner side thereof.
Claim 5
Dependent Claim
42 words
An air duct for drop ceilings according to claim 1 wherein said channel extends upwardly from said sheet and said sheet is in the form of a ceiling tile provided with openings extending therethrough for the discharge of air from said duct.
Claim 6
Dependent Claim
68 words
An air duct for drop ceilings having longitudinal and transverse members for supporting ceiling tiles, a U-shaped channel having outwardly extending legs, a sheet bridging said legs, said channel and sheet being supported by Said longitudinal and transverse members, the legs of said channel being cemented to said sheet and said sheet is in the form of a ceiling tile mechanically secured to said channel by fastening means.
Claim 7
Dependent Claim
68 words
An air duct for drop ceilings having longitudinal and transverse members for supporting ceiling tiles, a U-shaped channel having outwardly extending legs, a sheet bridging said legs, said channel and sheet being supported by Said longitudinal and transverse members, the legs of said channel being cemented to said sheet and said sheet is in the form of a ceiling tile mechanically secured to said channel by fastening means.
Claim 8
Dependent Claim
25 words
An air duct for drop ceilings according to claim 5 wherein said fastening means comprise clips secured to said channel legs and said ceiling tile.
Claim 9
Dependent Claim
27 words
An air duct for drop ceilings according to claim 2 wherein the sealing means for said abutting edges include strips bridging adjoining channels and fixedly secured thereto.
Claim 10
Dependent Claim
32 words
An air duct for drop ceilings according to claim 5 wherein said longitudinal and transverse members are inverted T-bars and said fastening means include tabs engaging at least certain of said T-bars.
Claim 11
Dependent Claim
53 words
An air duct for drop ceilings according to claim 1 wherein said channel has a cross-sectional area in the plane of the ends of said legs smaller than the area of said sheet and said legs are provided with outwardly extending means defining an area substantially equal to the area of said tile.
Claim 12
Dependent Claim
36 words
An air duct for drop ceilings according to claim 1 wherein said channel is formed of a single sheet of compressed polyurethane foam sheathed on at least one side with a continuous sheet of aluminum foil.
Claim 13
Dependent Claim
53 words
An air duct for drop ceilings according to claim 10 wherein said longitudinal and transverse members are inverted T-bars with the upwardly extending portion of the longitudinal T-bars having a height greater than the thickness of the tile and the transver T-bars having a height approximately equal to the thickness of the tile.
Claim 14
Dependent Claim
27 words
An air duct for drop ceilings according to claim 1 wherein said channel is formed of glass fibers compressed into a sheet and sheathed with metal foil.
Claim 15
Dependent Claim
53 words
An air duct for drop ceilings according to claim 12 wherein said longitudinal and transverse members are inverted T-bars with the upwardly extending portion of the longitudinal T-bars having a height greater than the thickness of the tile and the transverse T-bars having a height approximately equal to the thickness of the tile.
Claim 16
Dependent Claim
15 words
An air duct according to claim 1 wherein said channel is of non-uniform cross-sectional area.
Claim 17
Dependent Claim
21 words
An air duct according to claim 1 wherein said channel is curved in the plane of the ends of said legs.
Claim 18
Dependent Claim
20 words
An air duct for drop ceilings according to claim 1 wherein said channel depends from said longitudinal and transverse members.
Claim 19
Dependent Claim
45 words
An air duct for drop ceilings according to claim 1 wherein the legs of said channels include outwardly extending flanges, said sheet is secured to the outer surfaces of said flanges and said flanges engage said longitudinal and transverse members with said channel depending therefrom.
References Cited (Backward Citations)
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Cited
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Cited
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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) | 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 |