Patent US1490845A successfully refreshed from Google Patents.
US3829263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for reduced pressure casting of synthetic resins
Assignee: Rion Co Ltd
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Filing: 1972-07-10
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Granted: 1974-08-13
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Expires: 1992-07-10
Abstract
Abstract Workpieces to be encapsulated are put in place within cavities of a plastic mold one for each cavity. A container in which the mold is disposed is evacuated to a predetermined reduced pressure. At that time a liquid mixture of a snythetic resin and its hardener at room temperature begins to be sucked into the cavities to fill them. When the mixture escapes from the cavities through their escaping ports, the mixture supply is disconnected and the mold returns to the surrounding pressure. Then the resin solidifies into solids each encapsulating the individual workpiece.
Inventors
- 👤 C Yao
- 👤 H Tsuchiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:46
CPC Classifications
B; B29; B29C; B29C39/00; B29C39/22; B29C39/42; B29C39/02; B29C39/10; B29C70/00; B29C70/68; B29C70/72; B29C70/74; B29D; B29D12/00; B29D12/02; Y; Y10; Y10S; Y10S425/00; Y10S425/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
264 words
A device for casting a synthetic mixture of two liquid synthetic resins in predetermined proportions at room temperature and at a reduced pressure to encapsulate workpieces, comprising: a container capable of having a vacuum created therein; a mold having a plurality of cavities, each cavity capable of having a workpiece located therein and removably disposed within said container; an injection pipe communicating with the bottom of each of the cavities of said mold and adapted to inject the mixture of synthetic resins into the plurality of mold cavities a normally closed first electromagnetic valve disposed within said injection pipe for controlling the flow of the synthetic resin mixture; a vacuum pump operatively connected to said container for evacuating said container; a second electromagnetic valve operatively disposed between said vacuum pump and said container; and pressure control means for sensing a predetermined vacuum within said container and for sensing the complete filling of the mold cavities with the mixtures of synethetic resins for automatically controlling said vacuum pump and said first and second electromagnetic valves, said pressure control means including a plurality of escaping ports disposed in said mold, one of said plurality of eScaping ports connecting an associated mold cavity to the outer surface of the mold and switching means disposed adjacent a selected one of the escaping ports within the container to respond to the overflow of the liquid mixture from the mold through the selected escaping port to close the first electromagnetic valve while stopping the vacuum pump and turning the second electromagnetic valve to connect said container with the surrounding environment.
Claim 2
Independent Claim
264 words
A device for casting a synthetic mixture of two liquid synthetic resins in predetermined proportions at room temperature and at a reduced pressure to encapsulate workpieces, comprising: a container capable of having a vacuum created therein; a mold having a plurality of cavities, each cavity capable of having a workpiece located therein and removably disposed within said container; an injection pipe communicating with the bottom of each of the cavities of said mold and adapted to inject the mixture of synthetic resins into the plurality of mold cavities a normally closed first electromagnetic valve disposed within said injection pipe for controlling the flow of the synthetic resin mixture; a vacuum pump operatively connected to said container for evacuating said container; a second electromagnetic valve operatively disposed between said vacuum pump and said container; and pressure control means for sensing a predetermined vacuum within said container and for sensing the complete filling of the mold cavities with the mixtures of synethetic resins for automatically controlling said vacuum pump and said first and second electromagnetic valves, said pressure control means including a plurality of escaping ports disposed in said mold, one of said plurality of eScaping ports connecting an associated mold cavity to the outer surface of the mold and switching means disposed adjacent a selected one of the escaping ports within the container to respond to the overflow of the liquid mixture from the mold through the selected escaping port to close the first electromagnetic valve while stopping the vacuum pump and turning the second electromagnetic valve to connect said container with the surrounding environment.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |