US4086390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flywheel for recording and or reproducing apparatus
Assignee: Fine Sinter Co Ltd
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Filing: 1976-09-17
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Granted: 1978-04-25
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Expires: 1996-09-17
Abstract
Abstract Disclosed is a flywheel assembly for recording and or reproducing devices which is produced by molding and sintering a mixture consisting principally of iron and graphite powders and, if necessary, a sulfur powder.
Inventors
- 👤 Seishu Mitani
- 👤 Tsuneo Kudo
- 👤 Minoru Mitani
- 👤 Shuichi Saido
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:39
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/06; B22F7/062; B22F5/00; G; G11; G11B; G11B15/00; G11B15/18; B22F2998/00; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12042; Y10T428/12063; Y10T74/00; Y10T74/21; Y10T74/2121; Y10T74/2132
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A flywheel assembly used for recording and reproducing devices, characterized in that said assembly comprises a flywheel and a capstan force-fitted therein, said capstan being formed of an iron casting, said flywheel comprising a pressed and sintered mixture of powders consisting of iron powder, graphite powder, zinc stearate powder and sulfur powder, particles of said iron powder being bonded to adjacent iron powder particles at limited points on their surfaces to form voids therebetween, said voids being distributed uniformly throughout the flywheel.
Claim 2
Dependent Claim
82 words
A flywheel assembly used for recording and reproducing devices, characterized in that said assembly comprises a flywheel and a capstan force-fitted therein, said capstan being formed of an iron casting, said flywheel comprising a pressed and sintered mixture of powders consisting of iron powder, graphite powder, zinc stearate powder and sulfur powder, particles of said iron powder being bonded to adjacent iron powder particles at limited points on their surfaces to form voids therebetween, said voids being distributed uniformly throughout the flywheel.
References Cited (Backward Citations)
US3365351A
Cited
US3537332A
Cited
CA969780A
Cited
US3940268A
Cited
US3985043A
Cited
US3982934A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-24 | 1981-10-24 | 1982-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-24 | 1985-10-24 | 1986-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-24 | 1989-10-24 | 1990-04-25 | $7700.00 | Window Closed / Lapsed |