US3811903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicone coated injection moldable thermoplastic material
Assignee: Precision Metalsmiths Inc
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Filing: 1973-02-08
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Granted: 1974-05-21
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Expires: 1993-02-08
Abstract
Abstract Granules of solid, wax containing injection moldable, thermoplastic composition are coated with a silicone fluid to provide a material which is especially useful for making injection molded patterns to be used in the lost pattern processes of investment casting.
Inventors
- 👤 M Daskivich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:47
CPC Classifications
C; C08; C08J; C08J3/00; C08L; C08L1/00; C08L1/08; C08L1/26; C08L1/28; C08L83/00; C08L91/00; C08L91/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
26 words
A material as claimed in claim 1 in which the polysiloxane fluid is present in an amount of 0.1% to 0.5% by weight of said material.
Claim 2
Dependent Claim
52 words
A material consisting essentially of a solid, granulated, injection moldable thermoplastic composition containing a solidified blend of wax and compatible resin, the granules of said thermoplastic composition being coated with a dimethyl polysiloxane fluid, and said polysiloxane fluid being present in an amount of at least 0.03% by weight of said material.
Claim 3
Dependent Claim
74 words
A material consisting essentially of a solid, granulated, injection moldable thermoplastic composition containing at least 50% by weight of a solidified blend of wax and compatible resin, said wax being present in an amount of at least 10% by weight of said blend, the granules of said thermoplastic composition being coated with a dimethyl polysiloxane fluid, and said polysiloxane fluid being present in an amount of at least 0.03% by weight of said material.
Claim 4
Dependent Claim
26 words
A material as claimed in claim 4 in which the polysiloxane fluid is present in an amount of 0.1% to 0.5% by weight of said material.
Claim 5
Dependent Claim
64 words
A material consisting essentially of a solid, granulated, injection moldable, thermoplastic composition containing at least 50% by weight of a wax and resin blend, including a paraffin wax and an ethylene/vinyl acetate polymer, the granules of said thermoplastic composition being coated with a dimethyl polysiloxane fluid, and said polysiloxane fluid being present in an amount of at least 0.03% by weight of said material.
Claim 6
Dependent Claim
48 words
A material as claimed in claim 6 in which said ethylene/vinyl acetate polyer is present in an amount of from 5% to 40% by weight of said blend, and in which said paraffin wax is present in an amount of at least 10% by weight of said blend.
Claim 7
Dependent Claim
99 words
A material consisting essentially of a solid, granulated, injection moldable thermoplastic composition which is at least 50% by weight of a blend of the following ingredients: an ethylene/vinyl acetate polymer in an amount of from 5% to 40% by weight of said blend, and wax in an amount of from 10% to 50% by weight of said blend, said wax consisting at least partially of a paraffin wax; the granules of said thermoplastic composition being coated with a dimethyl polysiloxane fluid, and said polysiloxane fluid being present in an amount of at least 0.03% by weight of said material.
Claim 8
Dependent Claim
61 words
A material consisting essentially of a solid, granulated, injection moldable thermoplastic composition which is at least 50% by weight of a blend of ethyl cellulose and a fatty acid ketone, the granules of said thermoplastic composition being coated with a dimethyl polysiloxane fluid, and said polysiloxane fluid being present in an amount of at least 0.03% by weight of said material.
Claim 9
Dependent Claim
23 words
A material as claimed in claim 9 in which said fatty acid ketone is selected from the group consisting of laurone and stearone.
Claim 10
Dependent Claim
47 words
A material as claimed in claim 10 in which said ethyl cellulose is present in an amount of from 50% to 70% by weight of said blend and said fatty acid ketone is present in an amount of from 20% to 80% by weight of said blend.
Claim 11
Dependent Claim
27 words
A material as claimed in claim 11 in which the polysiloxane fluid is present in an amount of from 0.1% to 0.5% by weight of said material.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |