US4018552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressing block for die pressing thermoplastic material
Assignee: US Philips Corp
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Filing: 1975-11-05
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Granted: 1977-04-19
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Expires: 1995-11-05
Abstract
Abstract A pressing block for a phonograph or video record press in which ducts for cooling and heating media for the die are formed by a thin layer of a porous heat-conducting material provided between two thin metal sheets and bonded thereto. The assembly is connected on its side remote from the die to a supporting element of at least partially heat-insulating material.
Inventors
- 👤 Gijsbert Prast
- 👤 Andries Mijnheer
- 👤 Jan Mulder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:20
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/32; B29C43/52; B29C33/00; B29C33/02; B29C33/04; B29C43/02; B29C33/048; B29L; B29L2017/00; B29L2017/001; B29L2017/003; Y; Y10; Y10S; Y10S425/00; Y10S425/81
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
95 words
A pressing block for die pressing thermoplastic material, comprising a supporting element; a double-walled assembly, having a first wall connected to the supporting element for receiving a pressure load during pressing, and a second wall arranged to support a die for pressing, wherein said assembly comprises a thin layer of porous heat conducting material, and said first and second walls are formed by first and second thin metal sheets bonded to respective sides of the thin layer; and means for conducting pressurized heating and cooling media to said thin layer for flow through said layer.
Claim 2
Dependent Claim
95 words
A pressing block for die pressing thermoplastic material, comprising a supporting element; a double-walled assembly, having a first wall connected to the supporting element for receiving a pressure load during pressing, and a second wall arranged to support a die for pressing, wherein said assembly comprises a thin layer of porous heat conducting material, and said first and second walls are formed by first and second thin metal sheets bonded to respective sides of the thin layer; and means for conducting pressurized heating and cooling media to said thin layer for flow through said layer.
Claim 3
Dependent Claim
17 words
A pressing block as claimed in claim 1 wherein said heat conducting material consists of metal spheres.
Claim 4
Dependent Claim
17 words
A pressing block as claimed in claim 1 wherein said heat conducting material consists of metal gauze.
Claim 5
Dependent Claim
18 words
A pressing block as claimed in claim 3 wherein said gauze is bonded to said sheets by solder.
Claim 6
Dependent Claim
35 words
A pressing block as claimed in claim 3 wherein said thin layer has a thickness between 0.5 and 1 mm, and said metal sheets have each a thickness at the most equal to 3 mm.
Claim 7
Dependent Claim
28 words
A pressing block as claimed in claim 5, wherein at least a part of the supporting element engaging said first wall is made of reinforced synthetic heat-insulating material.
Claim 8
Dependent Claim
16 words
A pressing block as claimed in claim 6 wherein said heat-insulating material is glass reinforced polyimide.
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) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |