US4298324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for molding particulate expandable thermoplastic resin material using microwave heating
Assignee: Isobox Barbier SA
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Filing: 1979-09-21
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Granted: 1981-11-03
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Expires: 1999-09-21
Abstract
Abstract Molding of expanded plastic material such as dielectric material by microwave radiation is effected in a mold in which the part of the mold which contacts the material to be molded is of a material having high dielectric losses and capable of absorbing microwave radiation. Such mold portion preferably comprises a resin containing a small amount of carbon black.
Inventors
- 👤 Joel Soulier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:40
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/02; B29C33/06; B29C33/04; B29C33/38; B29C33/40; B29C33/56; B29C44/00; B29C44/34; B29C44/3415; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0855; B29K; B29K2105/00; B29K2105/04; B29K2707/00; B29K2707/04; B29K2709/00; B29K2709/08; B29K2863/00; Y; Y10; Y10S; Y10S425/00; Y10S425/013
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
109 words
A device for molding particulate expansible plastic dielectric material by microwave radiation, which comprises: a mold body, in combination with a press and a resonant cavity having wall members wherein the mold body includes a first portion comprising wall surfaces which define the mold cavity and which contact said plastic material to be molded said portion being formed of a resin containing microwave radiation-conducting carbon black which has high dielectric losses and which is microwave-absorbent and wherein the remaining portion of the mold body is made of a material which is essentially transparent to or transmissive of microwave radiation; and means for applying microwave radiation to said mold body.
Claim 2
Independent Claim
109 words
A device for molding particulate expansible plastic dielectric material by microwave radiation, which comprises: a mold body, in combination with a press and a resonant cavity having wall members wherein the mold body includes a first portion comprising wall surfaces which define the mold cavity and which contact said plastic material to be molded said portion being formed of a resin containing microwave radiation-conducting carbon black which has high dielectric losses and which is microwave-absorbent and wherein the remaining portion of the mold body is made of a material which is essentially transparent to or transmissive of microwave radiation; and means for applying microwave radiation to said mold body.
Claim 3
Dependent Claim
27 words
The device of claim 1 wherein said resin contains microwave radiation-conducting carbon black in a proportion of from about 1 to 5% by weight of said resin.
Claim 4
Dependent Claim
29 words
The device of claim 1 wherein said remainder of the mold body material comprises a resin with a filler or fibres of pure silica, having a low loss angle.
Claim 5
Dependent Claim
21 words
The device of claim 1 wherein said remainder of the mold body material comprises a resin with a glass fibre filler.
Claim 6
Dependent Claim
24 words
The device of claim 1 wherein said remainder of the mold body comprises a resin with a filler of pure silica and glass fibres.
Claim 7
Dependent Claim
16 words
The device of claim 1 wherein said fluid circulation means is located in the mold body.
Claim 8
Dependent Claim
131 words
A mold assembly for molding particulate expansible plastic dielectric material by microwave radiation which comprises: a mold body, in combination with a press and a resonant cavity having wall members wherein the mold body includes a first portion comprising wall surfaces which define the mold cavity and which contact the material to be molded said portion being formed of a resin containing microwave radiation-conducting carbon black which has high dielectric losses and which is microwave-absorbent and wherein the remaining portion of mold body is made of a material which is essentially transparent to or transmissive of microwave radiation; means for applying microwave radiation to said mold body; and means disposed within and connected to said resonant cavity wall members for circulation of heat-exchange fluid, in operative association with the mold body.
Claim 9
Dependent Claim
131 words
A mold assembly for molding particulate expansible plastic dielectric material by microwave radiation which comprises: a mold body, in combination with a press and a resonant cavity having wall members wherein the mold body includes a first portion comprising wall surfaces which define the mold cavity and which contact the material to be molded said portion being formed of a resin containing microwave radiation-conducting carbon black which has high dielectric losses and which is microwave-absorbent and wherein the remaining portion of mold body is made of a material which is essentially transparent to or transmissive of microwave radiation; means for applying microwave radiation to said mold body; and means disposed within and connected to said resonant cavity wall members for circulation of heat-exchange fluid, in operative association with the mold body.
Claim 10
Dependent Claim
22 words
The mold assembly of claim 7 wherein said microwave-absorbent carbon black is from about 1 to 5% by weight of said resin.
Claim 11
Independent Claim
115 words
An apparatus for molding particulate expansible plastic dielectric material by microwave radiation, the apparatus comprising: a press; a resonant cavity, having wall members, formed within the press, at least one mold body within the resonant cavity, wherein the mold body includes a first portion comprising wall surfaces which define the mold cavity and which contact said plastic material to be molded said portion being formed of resin containing microwave radiation-conducting carbon black which has a high dielectric loss and which is microwave-absorbent and wherein the remaining portion of the mold body is made of material which is essentially transparent to or transmissive of microwave radiation; and means for applying microwave radiation to said mold body.
Claim 12
Independent Claim
115 words
An apparatus for molding particulate expansible plastic dielectric material by microwave radiation, the apparatus comprising: a press; a resonant cavity, having wall members, formed within the press, at least one mold body within the resonant cavity, wherein the mold body includes a first portion comprising wall surfaces which define the mold cavity and which contact said plastic material to be molded said portion being formed of resin containing microwave radiation-conducting carbon black which has a high dielectric loss and which is microwave-absorbent and wherein the remaining portion of the mold body is made of material which is essentially transparent to or transmissive of microwave radiation; and means for applying microwave radiation to said mold body.
Claim 13
Dependent Claim
28 words
The apparatus of claim 9 wherein said resin contains microwave radiation conducting carbon black in a proportion of from about 1 to 5% by weight of said resin.
Claim 14
Dependent Claim
23 words
The apparatus of claim 9 wherein said remainder of the mold body material comprises a resin containing a filler of pure silica fibres.
Claim 15
Dependent Claim
21 words
The apparatus of claim 9 wherein said remainder of the mold body material comprises a resin with a glass fibre filler.
Claim 16
Dependent Claim
36 words
The apparatus of claim 9 which further comprises an electromagnetic field agitating means disposed in the resonant cavity operatively adjacent to the outlet of the waveguide thereinto, thereby to prevent the formation of standing waves therein.
Claim 17
Dependent Claim
32 words
The apparatus of claim 13 further comprising deflector means wherein said agitating means is cooperable with said deflector means for deflecting the microwave radiation into the resonant cavity adjacent said agitating means.
Claim 18
Dependent Claim
30 words
The mold assembly of claim 7, wherein said remainder of the mold body material comprises a resin with a filler of fibres of pure silica, having a low loss angle.
Claim 19
Dependent Claim
22 words
The mold assembly of claim 7, wherein said remainder of the mold body material comprises a resin with a glass fibre filler.
Claim 20
Dependent Claim
26 words
The mold assembly of claim 7, wherein said remainder of the mold body material comprises a resin with a filler of pure silica and glass fibres.
Claim 21
Dependent Claim
25 words
The apparatus of claim 9, wherein said remainder of the mold body material comprises a resin with a filler of pure silica and glass fibres.
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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) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |