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US3657032A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for continuously manufacturing reinforced plastic board

Assignee: Nitto Boseki Co Ltd
•
Filing: 1968-11-08
•
Granted: 1972-04-18
•
Expires: 1988-11-08
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Abstract

Abstract Method for continuously manufacturing reinforced plastic boards and by a liquid resin impregnation step which comprises successively depositing a layer of a heat-hardenable synthetic resin and a layer of fibrous material onto a lower inert film, and maintaining the thus formed composite in intimate contact over an arcuate path by depressing the composite with a plurality of arcuately deposed filamentary members which contact the composite, depositing an upper inert film onto the composite, compressing the upper and the lower film-contained unit, whereby excess resin solution is intimately saturated into the fibrous mat. The filamentary members are removed from the compressed composite by the passage of the reinforced plastic board from the processing area. Apparatus for continuously manufacturing reinforced plastic board is also disclosed in the specification.

Inventors

  • 👤 Shigeo Watanabe
  • 👤 Tomomi Yamaguchi

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-06 16:01
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/40; B29C70/50; B29C70/502; B29K; B29K2309/00; B29K2309/08

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 43 words
A method as in claim 1 wherein said filamentary members are fixed at one end thereof, and are removed from said upper and lower inert film-contained composite by the forward travel of said composite, the remaining end of said filamentary members being free.
Claim 2
Dependent Claim 23 words
A process as in claim 2 wherein said compression is performed by passing said upper and lower inert film-contained composite through squeezing rollers.
Claim 3
Dependent Claim 26 words
A method as in claim 3 wherein the free end of said filamentary members extends from about 30 to about 50 cm. beyond said squeezing rollers.
Claim 4
Dependent Claim 20 words
A method as in claim 1 which comprises the additional step of curing said upper and lower inert film-contained composite.

References Cited (Backward Citations)

US2771387A Cited
US2927623A Cited
US3163689A Cited
US3022622A Cited
US3449187A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-04-18 1975-10-18 1976-04-18 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-04-18 1979-10-18 1980-04-18 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-04-18 1983-10-18 1984-04-18 $7700.00 Window Closed / Lapsed

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