US4212838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacture of cantilever for pickup cartridge
Assignee: Panasonic Holdings Corp
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Filing: 1978-09-13
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Granted: 1980-07-15
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Expires: 1998-09-13
Abstract
Abstract A cantilever for a pickup cartridge comprising a base in the form of a solid rod or a pipe coated with a layer of a substance exhibiting a high modulus of elasticity ratio higher than 5000 Kg/mm2. The substance is for example boron or a boride. Described also is a process for manufacture of cantilevers wherein low pressure chemical vapor deposition or plasma chemical vapor deposition is used to cause the reaction between boron trichloride (BCl3) and hydrogen (H2) gases, thereby depositing boron or a boride on a base.
Inventors
- 👤 Koichi Azuma
- 👤 Masahiro Nagasawa
- 👤 Hiroshi Yamazoe
- 👤 Masaki Aoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:23
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/44; G11B3/46; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4981; Y10T428/00; Y10T428/13; Y10T428/29; Y10T428/2913; Y10T428/2916
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
68 words
A process for manufacture of cantilevers for pickup cartridges which comprises providing a base in the form of a solid rod or a pipe from a material which may be chemically or electrolytically etched, forming by vapor deposition a layer of a substance exhibiting a modulus of elasticity ratio higher than 5000 Kg/mm 2 on said base, said substance being boron or a boride, and removing said base.
Claim 2
Dependent Claim
68 words
A process for manufacture of cantilevers for pickup cartridges which comprises providing a base in the form of a solid rod or a pipe from a material which may be chemically or electrolytically etched, forming by vapor deposition a layer of a substance exhibiting a modulus of elasticity ratio higher than 5000 Kg/mm 2 on said base, said substance being boron or a boride, and removing said base.
Claim 3
Dependent Claim
33 words
A process for manufacture of cantilevers for pickup cartridges as set forth in claim 1 wherein said base is made of one of aluminum, titanium, tantalum, tungsten, molybdenum, copper, carbon, quartz and glass.
Claim 4
Dependent Claim
33 words
A process for manufacture of cantilevers for pickup cartridges as set forth in claim 1 in which said layer of a substance on said base is formed by low pressure chemical vapor deposition.
Claim 5
Dependent Claim
32 words
A process for manufacture of cantilevers for pickup cartridges as set forth in claim 1 in which said layer of a substance on said base is formed by plasma chemical vapor deposition.
Claim 6
Dependent Claim
33 words
A process for manufacture of cantilevers for pickup cartridges as set forth in claim 1, wherein said layer comprises boron or titanium boride formed by deposition from a gas comprising a boron compound.
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) | 1983-07-15 | 1984-01-14 | 1984-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-15 | 1988-01-14 | 1988-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-15 | 1992-01-14 | 1992-07-15 | $7700.00 | Window Closed / Lapsed |