US4447268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ivorylike composition plate for covering a wooden base and method for producing same
Assignee: Individual
•
Filing: 1983-06-10
•
Granted: 1984-05-08
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Expires: 2003-06-10
Abstract
Abstract Artificial ivorylike material having ideal properties suited, just like natural ivory, for keys of musical instruments is produced by dispersing either hydrated or non-hydrated inorganic filler in casein matrix with later-staged hardening by formalin.
Inventors
- 👤 Yutaka Oshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:53
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/01; C08K3/013
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
61 words
An ivorylike composition plate for covering a wooden base comprising casein resin matrix hardened with formaldehyde and from about 14.3 to about 47.0% by weight of hydrated inorganic filler selected from the group consisting of alumina hydrate, basic magnesium carbonate, hydrated aluminum silicate, magnesium silicate, hydrated silicic acid, calcium sulfate hydrate and hydrated calcium silicate, dispersed in said casein resin matrix.
Claim 2
Dependent Claim
61 words
An ivorylike composition plate for covering a wooden base comprising casein resin matrix hardened with formaldehyde and from about 14.3 to about 47.0% by weight of hydrated inorganic filler selected from the group consisting of alumina hydrate, basic magnesium carbonate, hydrated aluminum silicate, magnesium silicate, hydrated silicic acid, calcium sulfate hydrate and hydrated calcium silicate, dispersed in said casein resin matrix.
Claim 3
Dependent Claim
20 words
An ivorylike composition plate as claimed in claim 1 in which said formaldehyde is provided in the form of formalin.
Claim 4
Dependent Claim
17 words
An ivorylike composition plate as claimed in claim 1 further comprising one of pigments and acid dyes.
Claim 5
Independent Claim
109 words
A method for producing an ivorylike composition plate for covering a wooden base comprising the steps of mixing and kneading casein and hydrated inorganic filler selected from the group consisting of alumina hydrate, basic magnesium carbonate, hydrated aluminum silicate, magnesium silicate, hydrated silicic acid, calcium sulfate hydrate and hydrated calcium silicate with water to form a mixture; shaping said mixture to form a shaped plate; and impregnating said shaped plate with formaldehyde to harden said casein, said hydrated inorganic filler being present in said mixture in an amount sufficient to provide an ivorylike composition plate including from about 14.3% to about 47.0% by weight of said hydrated inorganic filler.
Claim 6
Independent Claim
109 words
A method for producing an ivorylike composition plate for covering a wooden base comprising the steps of mixing and kneading casein and hydrated inorganic filler selected from the group consisting of alumina hydrate, basic magnesium carbonate, hydrated aluminum silicate, magnesium silicate, hydrated silicic acid, calcium sulfate hydrate and hydrated calcium silicate with water to form a mixture; shaping said mixture to form a shaped plate; and impregnating said shaped plate with formaldehyde to harden said casein, said hydrated inorganic filler being present in said mixture in an amount sufficient to provide an ivorylike composition plate including from about 14.3% to about 47.0% by weight of said hydrated inorganic filler.
Claim 7
Dependent Claim
18 words
A method as claimed in claim 4 in which said formaldehyde is provided in the form of formalin.
Claim 8
Dependent Claim
27 words
Method as claimed in claim 4 in which 25 to 75 parts by weight of hydrated inorganic filler is mixed with 100 parts by weight of casein.
Claim 9
Dependent Claim
26 words
Method as claimed in claim 4 in which 1 to 10 parts by weight of pigment is further added to 100 parts by weight of casein.
Claim 10
Dependent Claim
27 words
Method as claimed in claim 4 in which 1 to 10 parts by weight of acid dye is further added to 100 parts by weight of casein.
Claim 11
Dependent Claim
28 words
Method as claimed in claim 4 in which 1 to 50 parts by weight of non-hydrated inorganic filler is further added to 100 parts by weight of casein.
Claim 12
Dependent Claim
28 words
Method as claimed in claim 9 in which 5 to 20 parts by weight of non-hydrated inorganic filler is further added to 100 parts by weight of casein.
Claim 13
Dependent Claim
29 words
Method as claimed in claim 9 in which said non-hydrated inorganic filler is chosen from a group consisting of calcium phosphate, silicon dioxide, alumina, calcium carbonate and barium sulfate.
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) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |