US3772844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating fire resistant duct or shaft
Assignee: Individual
•
Filing: 1972-05-24
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Granted: 1973-11-20
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Expires: 1992-05-24
Abstract
Abstract A method of fabricating a fire resistant duct or shaft wherein channel shaped runners are installed on the floor and ceiling about aligned openings therein, assembling a plurality of elongated panel blanks to extend vertically beween the floor and ceiling runners, each panel being equipped with longitudinally extending edge flanges and central studs, securing the flanges together and applying a mesh to the studs and thereafter covering the exterior of the panel blanks with at least two layers of plaster.
Inventors
- 👤 P Thorne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:43
CPC Classifications
E; E04; E04F; E04F17/00; E04F17/005; E04F13/00; E04F13/02; E04F13/04; E04F13/045; E04F13/047; E04F13/06; E04F2013/063
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
171 words
In a method of fabricating a fire resistant vertical duct, the steps of installing in vertically aligned generally rectangular arrays a plurality of generally channel shaped runners about openings in the floor and ceiling of a space in which a duct is to be located, assemblying a plurality of elongated panel blanks in side-byside relation within said runners and extending between said floor and ceiling, each panel blank including a generally planar substantially rigid imperforate sheet having its longitudinal margins formed into outwardly facing integral flanges and securing the flanges of adjacent blanks together, each panel blank further including at least two elongated studs spaced from but parallel to said flanges and securing a wire network to said studs to dispose the same parallel to said blank, applying a first coat of plaster to said assembled blanks, and after the first coat has set applying a second coat of plaster to said assembled blanks to achieve a thickness of plaster sufficient to overlie said network and provide a predetermined fire rating.
Claim 2
Dependent Claim
171 words
In a method of fabricating a fire resistant vertical duct, the steps of installing in vertically aligned generally rectangular arrays a plurality of generally channel shaped runners about openings in the floor and ceiling of a space in which a duct is to be located, assemblying a plurality of elongated panel blanks in side-byside relation within said runners and extending between said floor and ceiling, each panel blank including a generally planar substantially rigid imperforate sheet having its longitudinal margins formed into outwardly facing integral flanges and securing the flanges of adjacent blanks together, each panel blank further including at least two elongated studs spaced from but parallel to said flanges and securing a wire network to said studs to dispose the same parallel to said blank, applying a first coat of plaster to said assembled blanks, and after the first coat has set applying a second coat of plaster to said assembled blanks to achieve a thickness of plaster sufficient to overlie said network and provide a predetermined fire rating.
Claim 3
Dependent Claim
16 words
The method of claim 1 in which the application of said plaster is achieved through spraying.
Claim 4
Dependent Claim
25 words
The method of claim 1 in which said plaster is a gypsum plaster containing perlite as an aggregate with the plaster mix being relatively stiff.
Claim 5
Dependent Claim
62 words
The method of claim 1 in which said runners include essentially J-shaped members spaced apart a distance slightly greater than the height of each panel blank whereby each panel blank is installed by introducing the same into the upper runner, pivoting said panel blank into position above the lower runner, and thereafter lowering said panel blank into position within said lower runner.
Claim 6
Dependent Claim
29 words
The method of claim 1 in which said blank has integral studs provided therein by rolling to provide generally V-shaped projections extending parallel to said outwardly facing integral flanges.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |