Patent US4446091A successfully refreshed from Google Patents.
US4446091A
Expired / Lapsed
US
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Carbon fiber-reinforced cement mould
Assignee: BP Corp North America Inc
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Filing: 1982-03-23
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Granted: 1984-05-01
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Expires: 2002-03-23
Abstract
Abstract A carbon fiber-reinforced cement mould is provided which is capable of being thermally cycled continually at temperatures up to 200° C. Such mould is particularly suitable for casting or forming plastic articles which require heating up to 200° C. to effect curing. Because the mould remains free from cracking and surface spalling during such thermal cycling, it can be used over and over again.
Inventors
- 👤 Reginald D. Pairaudeau
- 👤 David Turnbull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:44
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/34; B29; B29C; B29C33/00; B29C33/38; E; E04; E04C; E04C5/00; E04C5/07; E04C5/073; H; H01; H01Q; H01Q15/00; H01Q15/14; H01Q15/141; B29K; B29K2709/00; B29K2709/06; B29K2909/00; B29K2909/06; B29L; B29L2031/00; B29L2031/34; B29L2031/3456
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
102 words
In a process for making and using a mold wherein a heat curable plastics composition is disposed in said mold and cured by heat, the improvement comprising: making said mold by combining carbon fibers with hydraulic cement and aggregate in the proportions of 1 to 6 parts by weight of said fibers to 100 parts by weight of said cement and aggregate and forming a coating, and mold surfaces to be in contact with said plastics composition such that said coating contains not more than 1-3 parts of carbon fibers by weight to 100 parts by weight of hydraulic cement and aggregate.
Claim 2
Dependent Claim
102 words
In a process for making and using a mold wherein a heat curable plastics composition is disposed in said mold and cured by heat, the improvement comprising: making said mold by combining carbon fibers with hydraulic cement and aggregate in the proportions of 1 to 6 parts by weight of said fibers to 100 parts by weight of said cement and aggregate and forming a coating, and mold surfaces to be in contact with said plastics composition such that said coating contains not more than 1-3 parts of carbon fibers by weight to 100 parts by weight of hydraulic cement and aggregate.
Claim 3
Dependent Claim
34 words
The process of claim 1, wherein said mould is produced with 2.5 parts by weight to 5 parts by weight of carbon fibers per 100 parts by weight of cement and aggregate filler material.
Claim 4
Dependent Claim
34 words
The process of claim 1, wherein said mould is produced with 1 part by weight to 3 parts by weight of carbon fibers per 100 parts by weight of cement and aggregate filler material.
Claim 5
Dependent Claim
19 words
The process of claim 1, wherein said finished surface is from about 4 mm to about 6 mm thick.
Claim 6
Dependent Claim
16 words
The process of claim 1, wherein said mould is produced in the shape of a paraboloid.
References Cited (Backward Citations)
US2317597A
Cited
US2324990A
Cited
US3783092A
Cited
US3834916A
Cited
DE2633310A1
Cited
US4302414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |