US3638299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of molds
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1969-12-16
•
Granted: 1972-02-01
•
Expires: 1989-12-16
Abstract
Abstract Producing a mold by forming a metal shell around a model, the model being provided with a lip around its base over which the metal shell is formed to key it to the model.
Inventors
- 👤 Paul Johnson Garner
- 👤 Thomas Robert Stephen Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:55
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/38; B29C33/56; B29K; B29K2709/00; B29K2709/06; Y; Y10; Y10S; Y10S425/00; Y10S425/03; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49982
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
90 words
A process for making a mold comprising forming a model of an article to be molded and providing said model with a protruding lip surrounding the part of the model which defines the article to be molded, forming a metal shell around said model and spraying metal over the protruding lip thereby keying the metal shell to the model, affixing heating or cooling pipes on said metal shell and applying a reinforcing materials to provide a backing to said shell and to encase the pipes while leaving their ends exposed.
Claim 2
Dependent Claim
90 words
A process for making a mold comprising forming a model of an article to be molded and providing said model with a protruding lip surrounding the part of the model which defines the article to be molded, forming a metal shell around said model and spraying metal over the protruding lip thereby keying the metal shell to the model, affixing heating or cooling pipes on said metal shell and applying a reinforcing materials to provide a backing to said shell and to encase the pipes while leaving their ends exposed.
Claim 3
Dependent Claim
17 words
A process according to claim 1 in which the metal shell is at least one-sixteenth inch thick.
Claim 4
Dependent Claim
23 words
A process according to claim 1 in which the shell is provided with a reinforcing backing before it is removed from the model.
Claim 5
Dependent Claim
68 words
A process according to claim 1 in which the reinforcing material is applied in two stages, the first stage being a protective layer to render the metal shell self-supporting and the second stage to enable the mold to withstand force during molding wherein the shell is removed from said model after the first stage of the reinforcing material has been applied and before application of the second stage.
Claim 6
Dependent Claim
29 words
A process according to claim 1 in which the model is mounted on a base which has angled edges which provide the lip over which the metal shell keys.
Claim 7
Dependent Claim
22 words
A process according to claim 1 in which the model is coated with a release agent before formation of the metal shell.
Claim 8
Dependent Claim
16 words
A process according to claim 1 in which the metal shell is formed by electrode position.
Claim 9
Dependent Claim
16 words
A process according to claim 1 in which the metal shell is formed by metal spraying.
Claim 10
Dependent Claim
21 words
A process according to claim 8 in which the metal shell is produced by flame spraying and is entirely of zinc.
Claim 11
Dependent Claim
28 words
A process according to claim 1 in which the metal shell consists of a layer of zinc at least 0.050 inch backed by low-carbon steel, copper or aluminum.
Claim 12
Dependent Claim
19 words
A process according to claim 1 in which the shell is formed by compressed air spraying of molten metal.
Claim 13
Dependent Claim
17 words
A process according to claim 11 in which the metal is an alloy of bismuth and tin.
Claim 14
Dependent Claim
20 words
A process according to claim 1 in which the metal shell is applied to a thickness of about one-fourth inch.
Claim 15
Dependent Claim
17 words
A process according to claim 1 in which the model is provided with heating or cooling pipes.
Claim 16
Dependent Claim
24 words
A process according to claim 1 in which at least the layer of reinforcing material adjacent to the metal shell is of aluminous cement.
Claim 17
Dependent Claim
13 words
A process according to claim 1 in which the reinforcing material is concrete.
Claim 18
Dependent Claim
24 words
A process according to claim 6 in which the metal shell is coated with impervious paint before it is backed with the reinforcing material.
References Cited (Backward Citations)
US3000094A
Cited
US3427185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |