US4168348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perforated laminated material
Assignee: Rolls Royce PLC
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Filing: 1977-11-03
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Granted: 1979-09-18
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Expires: 1997-11-03
Abstract
Abstract A material suitable for making combustion chambers for gas turbine engines comprises at least two abutting sheets of perforated material, the perforation being out of alignment and interconnected by a series of channels formed on one or both of the abutting surfaces of abutting sheets. The total cross-sectional area of the perforations in at least one sheet is at least double the total cross-sectional area of the perforations in the remaining sheets or sheets per unit area.
Inventors
- 👤 Jagnandan K. Bhangu
- 👤 Brian D. Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:49
CPC Classifications
F; F23; F23M; F23M5/00; F23M5/08; F23M5/085; F23R; F23R3/00; F23R3/002; F05; F05B; F05B2250/00; F05B2250/10; F05B2250/19; F05B2250/191; F23R2900/00; F23R2900/03044; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12201; Y10T428/12292; Y10T428/12347; Y10T428/24; Y10T428/24273; Y10T428/24322
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
210 words
A perforate laminated material comprising first and second abutting sheets of high temperature resistant material having abutting surfaces bonded together in face-to-face relationship, each of the said sheets being provided with a plurality of perforations, the perforations in the adjacent sheets being out of alignment, at least one of the abutting surfaces of the sheets being provided with channels defining passageways in the material interconnecting said perforations of said first sheet with said perforations in said second sheet, said perforations in said first sheet being operable to meter the flow of a cooling fluid successively through said first and second sheets, whereby discrete flows of fluid pass through said perforations in said first sheet and impinge upon the inside surface of said second sheet, the total cross-sectional area of the perforations in said second sheet being at least double the total cross-sectional area of the perforations in the first sheet in a predetermined area of material whereby the velocity of the fluid passing through said second sheet perforations is less than that passing through said first sheet perforations and the fluid emitted from said second sheet perforations, tends to coalesce and substantially produce a film of fluid adjacent to the outer surface of said second sheet over said predetermined area.
Claim 2
Dependent Claim
210 words
A perforate laminated material comprising first and second abutting sheets of high temperature resistant material having abutting surfaces bonded together in face-to-face relationship, each of the said sheets being provided with a plurality of perforations, the perforations in the adjacent sheets being out of alignment, at least one of the abutting surfaces of the sheets being provided with channels defining passageways in the material interconnecting said perforations of said first sheet with said perforations in said second sheet, said perforations in said first sheet being operable to meter the flow of a cooling fluid successively through said first and second sheets, whereby discrete flows of fluid pass through said perforations in said first sheet and impinge upon the inside surface of said second sheet, the total cross-sectional area of the perforations in said second sheet being at least double the total cross-sectional area of the perforations in the first sheet in a predetermined area of material whereby the velocity of the fluid passing through said second sheet perforations is less than that passing through said first sheet perforations and the fluid emitted from said second sheet perforations, tends to coalesce and substantially produce a film of fluid adjacent to the outer surface of said second sheet over said predetermined area.
Claim 3
Dependent Claim
47 words
A perforate laminated material as claimed in claim 1 in which the perforations of the first and second sheets comprise circular holes having the same diameter, said second sheet having at least twice as many holes as said first sheet in a predetermined area of the material.
Claim 4
Dependent Claim
37 words
A perforate laminated material as claimed in claim 1 in which the perforations of each of said sheets comprise holes and in which the holes in each sheet are evenly distributed over the surfaces of the sheet.
Claim 5
Dependent Claim
34 words
A perforate laminated material as claimed in claim 1 in which the perforations in each of said sheets comprise holes, the holes in each sheet being randomly distributed over the surfaces of the sheets.
Claim 6
Dependent Claim
30 words
A perforate laminated material as claimed in claim 1 in which the perforations in said first sheet comprise circular holes, and the perforations in said second sheet comprise rectangular slots.
Claim 7
Dependent Claim
20 words
A perforate laminated material as claimed in claim 5 in which said rectangular slots are arranged parallel to one another.
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) | 1982-09-17 | 1983-03-19 | 1983-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-17 | 1987-03-19 | 1987-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-17 | 1991-03-19 | 1991-09-18 | $7700.00 | Window Closed / Lapsed |