US4752204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for compression forming thermoplastic resin sheets
Assignee: Asahi Kasei Corp
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Filing: 1986-06-12
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Granted: 1988-06-21
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Expires: 2006-06-12
Abstract
Abstract A compression forming apparatus for forming a thermoplastic resin sheet is disclosed wherein a thermoplastic resin blank is compressed between a pair of heated mold plates, the mold plates are cooled to solidify the thus-formed sheet, and the sheet is taken out from the mold plates. This compression forming apparatus has a clamping device, a pair of cooling die plates, a pair of mold plates which are attached to the cooling die plates, means for heating the mold plates, and springs or actuators enabling the mold plates to be held in contact with the cooling die plates when the mold plates are clamped and held in non-contact with the cooling die plates when the mold plates are opened.
Inventors
- 👤 Hiroshi Kataoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:37
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/1055; B32B17/10743; B29; B29C; B29C43/00; B29C43/32; B29C43/52; B29C55/00; B29C55/005; B29C55/02; B29C55/10; B29C55/12; B29C55/16; B29C55/165; B32B17/10807; B32B17/10981; B29K; B29K2033/00; B29K2033/04; B29K2995/00; B29K2995/0037; B29K2995/0088; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/31; Y10T428/31504; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
144 words
A compression forming apparatus for forming a thermoplastic resin sheet of the type wherein a thermoplastic resin blank is compressed between a pair of heated mold plates, the mold plates are cooled to solidify the formed sheet, and the sheet is taken out from the mold plates, said apparatus comprising a pair of cooling die plates, a pair of mold plates which are attached to the cooling die plates, means for clamping the mold plates together, a plate-form heater operable to heat the mold plates when the heater is sandwiched between the pair of the mold plates, said plate-form heater being removable from between the pair of mold plates, and means for holding the mold plates in contact with the cooling die plates when the mold plates are clamped together and in non-contact with the cooling die plates when the mold plates are opened.
Claim 2
Dependent Claim
144 words
A compression forming apparatus for forming a thermoplastic resin sheet of the type wherein a thermoplastic resin blank is compressed between a pair of heated mold plates, the mold plates are cooled to solidify the formed sheet, and the sheet is taken out from the mold plates, said apparatus comprising a pair of cooling die plates, a pair of mold plates which are attached to the cooling die plates, means for clamping the mold plates together, a plate-form heater operable to heat the mold plates when the heater is sandwiched between the pair of the mold plates, said plate-form heater being removable from between the pair of mold plates, and means for holding the mold plates in contact with the cooling die plates when the mold plates are clamped together and in non-contact with the cooling die plates when the mold plates are opened.
Claim 3
Dependent Claim
25 words
A compression forming apparatus according to claim 1, wherein said means for holding are springs provided in the end portions of the respective mold plates.
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) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |