US3861977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for vacuum bag molding
Assignee: Rudkin Wiley Corp
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Filing: 1972-11-21
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Granted: 1975-01-21
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Expires: 1992-11-21
Abstract
Abstract In the manufacture of a molded article having a shell layer and a core, an intimate bond is formed between the shell layer and the core layer of the molded article, using a unique variation of the vacuum bag technique of sealing the peripheral edge of the vacuum bag directly to a portion of the article. Using this technique, while providing for greater flexibility in the selection of sealing positions, only the critical portion of the article is exposed to the vacuum, thereby allowing the noncritical area to be exposed to air. As a result, greater flexibility in the selection of sealing positions is provided and, in most instances, eliminates the need for tailor-made vacuum bags.
Inventors
- 👤 Nathaniel C Wiley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:19
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/003; B29C63/00; B29C63/0017; B29C63/0021; B29C63/02; B29C63/04; B29C63/042; B29C63/16; B32; B32B; B32B17/00; B32B17/06; B32B17/067; B32B27/00; B32B27/06; B32B27/08; B32B27/12; B32B37/00; B29K; B29K2309/00; B29K2309/08; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/0278; B32B2375/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
46 words
The method defined in claim 1, comprising the additional steps of: F. positioning a support member peripherally about said core layer after applying said core layer to said first shell layer; and G. sealing the peripheral edge of said vacuum bag directly to said support member.
Claim 2
Independent Claim
164 words
A method for bonding a core layer between two fiber and resin layers comprising the steps of: A. applying a first fiber and resin layer tO a mold wherein said first fiber and resin layer comprises an air-inhibiting resin; B. applying a core layer directly to said first fiber and resin layer for bonding therewith; C. covering said core layer to be bonded with a vacuum bag; D. sealing the peripheral edges of said vacuum bag directly to a portion of the fiber and resin layer on the mold extending peripherally beyond said core layer; E. withdrawing air from within the sealed bag, thereby reducing the air pressure therein; F. maintaining said reduced air pressure within said sealed bag until said first fiber and resin layer and said core layer are intimately bonded; G. removing said vacuum bag from the cured intimately bonded layers; and H. applying a second fiber and resin layer to said core layer and said first fiber and resin layer.
Claim 3
Dependent Claim
31 words
The method defined in claim 3, comprising the additional step of: I. applying a surface gel coat layer to the mold prior to application of said first fiber and resin layer.
Claim 4
Dependent Claim
21 words
The process defined in claim 4, wherein Steps (A)-(F) are carried out within 12 hours after the performance of Step (G).
Claim 5
Dependent Claim
27 words
The process defined in claim 3, comprising the additional step of: I. applying a support member directly to said first fiber and resin layer for bonding therewith.
Claim 6
Dependent Claim
20 words
The process defined in claim 6, wherein the peripheral edge of said vacuum bag is sealed against said support member.
Claim 7
Dependent Claim
16 words
The method defined in claim 6, wherein said support member incorporates a resin overflow directing channel.
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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) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |