US4863807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-layered thermal insulating piston cap
Assignee: Purolator Facet Inc
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Filing: 1988-09-19
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Granted: 1989-09-05
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Expires: 2008-09-19
Abstract
Abstract A multi-layered insulating piston cap for cast metal pistons having an insulating, perforated metal sheet layer. A piston cap is provided having a top sheet continuous layer made of a heat and corrosion resistant metal for protecting the piston cap, a second layer made of heat and corrosion resistant metal sheet having a plurality of spaced apart perforations for providing trapped air spaces, a third layer made of a heat and corrosion resistant metal foil for sealing the perforations, and a fourth layer or porous, heat and corrosion resistant metal for anchoring the piston cap to the piston. One coined geometry can be used when blanking various sized cross-sections of piston cap.
Inventors
- 👤 Stephen Krasicky, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:21
CPC Classifications
F; F02; F02F; F02F3/00; F02F3/10; F02F3/12; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/021; F05C2201/04; F05C2201/0433; F05C2201/0448; F05C2201/046; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/1234; Y10T428/12444
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
89 words
A multi-layer piston cap for a castable internal combustion engine piston, comprising: an exterior layer formed of a continuous metal sheet; a first single piece metal sheet layer having a plurality of separated perforations, said first single piece metal sheet layer being bonded to said exterior layer; a second metal sheet layer formed of a continuous metal sheet, said second metal sheet being bonded to said first metal sheet; and a mesh layer formed of a porous metal structure, said mesh layer being bonded to said second metal sheet.
Claim 2
Dependent Claim
89 words
A multi-layer piston cap for a castable internal combustion engine piston, comprising: an exterior layer formed of a continuous metal sheet; a first single piece metal sheet layer having a plurality of separated perforations, said first single piece metal sheet layer being bonded to said exterior layer; a second metal sheet layer formed of a continuous metal sheet, said second metal sheet being bonded to said first metal sheet; and a mesh layer formed of a porous metal structure, said mesh layer being bonded to said second metal sheet.
Claim 3
Dependent Claim
30 words
The multi-layer piston cap of claim 1 wherein each said metal of each of said layers is selected from the group consisting of stainless steel, cobalt, nickel and chromium alloys.
Claim 4
Dependent Claim
20 words
The multi-layer piston cap of claim 1, wherein each said bond between each of said layers is a diffusion bond.
Claim 5
Dependent Claim
48 words
The multi-layer piston cap of claim 1, wherein said first single piece metal sheet layer is made of a metal selected from the group consisting of stainless steel, cobalt, nickel and chromium alloys, and said plurality of separated perforations are holes in a substantially 29% open straight pattern.
Claim 6
Dependent Claim
131 words
A multi-layer piston cap for a castable internal combustion engine piston, comprising: a first layer made of a noncorrosive and heat resistant metal, said first layer being in the form of a continuous metal sheet; a second single piece layer bonded to said first layer, said second single piece layer being made of a noncorrosive and heat resistant metal, said second single piece layer having a plurality of spaced apart holes; a third layer bonded to said second single piece layer, said third layer being made of a noncorrosive and heat resistant continuous metal foil; and a fourth layer bonded to said third layer, said fourth layer being made of a noncorrosive and heat resistant metal, said fourth layer being in the form of a metal mesh having a porous structure.
Claim 7
Dependent Claim
131 words
A multi-layer piston cap for a castable internal combustion engine piston, comprising: a first layer made of a noncorrosive and heat resistant metal, said first layer being in the form of a continuous metal sheet; a second single piece layer bonded to said first layer, said second single piece layer being made of a noncorrosive and heat resistant metal, said second single piece layer having a plurality of spaced apart holes; a third layer bonded to said second single piece layer, said third layer being made of a noncorrosive and heat resistant continuous metal foil; and a fourth layer bonded to said third layer, said fourth layer being made of a noncorrosive and heat resistant metal, said fourth layer being in the form of a metal mesh having a porous structure.
Claim 8
Dependent Claim
30 words
The multi-layer piston cap of claim 5 wherein each said metal of each of said layers is selected from the group consisting of stainless steel, cobalt, nickel and chromium alloys.
Claim 9
Dependent Claim
20 words
The multi-layer piston cap of claim 5 wherein each said bond between each of said layers is a diffusion bond.
Claim 10
Dependent Claim
46 words
The multi-layer piston cap of claim 5 wherein said second single piece layer is made of a metal selected from a group consisting of stainless steel, cobalt, nickel and chromium alloys, and said plurality of spaced apart holes are in a substantially 29% open straight pattern.
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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) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |