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US4042090A
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Key top
Assignee: Chiyoda Grabure Corp
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Filing: 1974-09-17
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Granted: 1977-08-16
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Expires: 1994-09-17
Abstract
Abstract A key top comprises a key top base comprising a side portion and a top portion having a specified color, a colored portion provided at a part of the top portion and having a color different from the specified color of the top portion, and, a protective layer composed of a transparent material having an abrasion resistance and covering at least the colored portion.
Inventors
- 👤 Sadao Hasebe
- 👤 Hiromitsu Ono
- 👤 Minoru Murata
- 👤 Yuji Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:37
CPC Classifications
B; B41; B41J; B41J5/00; B41J5/08; B41J5/12; H; H01; H01H; H01H13/00; H01H13/02; H01H13/12; H01H13/14; H01H2209/00; H01H2209/016; H01H2219/00; H01H2219/028; H01H2219/034
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A key top which comprises: i. a key top base composed of an integrally formed ABS resin having a side portion and a top portion, ii. a colored portion in the form of a sign provided on the top portion of the key top base, the colored portion consisting essentially of a mixture of polyvinyl chloride, polymethyl methacrylate and a colorant, iii. an adhering layer provided between the top portion of the key top base and the colored portion, the adhering layer consisting essentially of a mixture of styreen resin and synthetic rubber, iv. a protecting layer covering at least the colored portion, the protecting layer consisting essentially of a thermoplastic material of a mixture of polyvinyl chloride and nitrocellulose, and v. a second protecting layer covering the above mentioned protecting layer, the second protecting layer consisting essentially of a mixture of polyvinyl chloride, synthetic rubber, and silicon.
Claim 2
Dependent Claim
148 words
A key top which comprises: i. a key top base composed of an integrally formed ABS resin having a side portion and a top portion, ii. a colored portion in the form of a sign provided on the top portion of the key top base, the colored portion consisting essentially of a mixture of polyvinyl chloride, polymethyl methacrylate and a colorant, iii. an adhering layer provided between the top portion of the key top base and the colored portion, the adhering layer consisting essentially of a mixture of styreen resin and synthetic rubber, iv. a protecting layer covering at least the colored portion, the protecting layer consisting essentially of a thermoplastic material of a mixture of polyvinyl chloride and nitrocellulose, and v. a second protecting layer covering the above mentioned protecting layer, the second protecting layer consisting essentially of a mixture of polyvinyl chloride, synthetic rubber, and silicon.
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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) | 1980-08-15 | 1981-02-14 | 1981-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-15 | 1985-02-14 | 1985-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-15 | 1989-02-14 | 1989-08-16 | $7700.00 | Window Closed / Lapsed |