Patent US4540440A successfully refreshed from Google Patents.
US4540440A
Expired / Lapsed
US
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Ivorylike composition plate for covering a wooden base and a method for producing the same
Assignee: Nippon Gakki Co Ltd
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Filing: 1984-05-11
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Granted: 1985-09-10
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Expires: 2004-05-11
Abstract
Abstract An artificial ivorylike composition plate having ideal properties well suited, just like natural ivory, for covering a wooden base for key of a musical instrument is produced by dispersing non-hydrated inorganic filler in casein matrix with later hardening by folmalin.
Inventors
- 👤 Yutaka Oshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:20
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/01; C08K3/013
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
46 words
An ivorylike composition plate for covering a wooden base comprising casein matrix hardened with folmaldehyde and from about 14.3 to about 69.5% by weight of non-hydrated inorganic filler selected from a group consisting of silica oxide, calcium phosphate, alumina, calcium carbonate, barium sulfate and calcium sulfate.
Claim 2
Dependent Claim
46 words
An ivorylike composition plate for covering a wooden base comprising casein matrix hardened with folmaldehyde and from about 14.3 to about 69.5% by weight of non-hydrated inorganic filler selected from a group consisting of silica oxide, calcium phosphate, alumina, calcium carbonate, barium sulfate and calcium sulfate.
Claim 3
Dependent Claim
27 words
An ivorylike composition plate as claimed in claim 1 in which the grain size of said non-hydrated inorganic filler is in the range from 10 to 200μ.
Claim 4
Dependent Claim
26 words
An ivorylike composition plate as claimed in claim 1 or 2 further comprising a component selected from the group consisting of of pigments and acid dyes.
Claim 5
Independent Claim
102 words
A method for producing an ivorylike composition plate for covering a wooden base comprising the steps of mixing and kneading casein resin and non-hydrated inorganic filler selected from a group consisting of silica oxide, calcium phosphate, alumina, calcium carbonate, barium sulfate and calcium sulfate, with water to form a mixture; shaping said mixture to a shaped plate; and impregnating said shaped plate with formaldehyde to harden said casein resin, said non-hydrated inorganic filler being present in said mixture in an amount sufficient for providing an ivorylike composition plate containing from about 14.3 to about 69.5% by weight of said non-hydrated inorganic filler.
Claim 6
Independent Claim
102 words
A method for producing an ivorylike composition plate for covering a wooden base comprising the steps of mixing and kneading casein resin and non-hydrated inorganic filler selected from a group consisting of silica oxide, calcium phosphate, alumina, calcium carbonate, barium sulfate and calcium sulfate, with water to form a mixture; shaping said mixture to a shaped plate; and impregnating said shaped plate with formaldehyde to harden said casein resin, said non-hydrated inorganic filler being present in said mixture in an amount sufficient for providing an ivorylike composition plate containing from about 14.3 to about 69.5% by weight of said non-hydrated inorganic filler.
Claim 7
Dependent Claim
30 words
A method as claimed in claim 4 in which 10 to 200 parts by weight of said non-hydrated filler is mixed with 100 parts by weight of said casein resin.
Claim 8
Dependent Claim
29 words
A method as claimed in claim 5 in which 1 to 10 parts by weight of pigment is further added to 100 parts by weight of said casein resin.
Claim 9
Dependent Claim
30 words
A method as claimed in claim 5 in which 1 to 10 parts by weight of acid dye is further added to 100 parts by weight of said casin resin.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-09 | 1989-03-11 | 1989-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-09 | 1993-03-11 | 1993-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-09 | 1997-03-11 | 1997-09-10 | $7700.00 | Window Closed / Lapsed |