Patent US4544977A successfully refreshed from Google Patents.
US4544977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic disc device
Assignee: Sony Corp
•
Filing: 1982-08-30
•
Granted: 1985-10-01
•
Expires: 2002-08-30
Abstract
Abstract A flexible magnetic disc cassette contains a flexible magnetic disc which is driven by a shaft associated with a driving device. The disc is contained within a cover having an upper half and lower half. An anti-wearing member is attached on an inner surface of the upper half of the cover for abutment with the driving device shaft so as to correct warpage of the upper half of the cover.
Inventors
- 👤 Kazuo Ozawa
- 👤 Tetsuo Sawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:12
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/03; G11B23/033; G11B23/0332; G11B17/00; G11B17/02; G11B17/022; G11B17/028; G11B17/03
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
156 words
A magnetic disc cassette formed of a flexible magnetic disc received on a driving mechanism having a shaft associated therewith, comprising: a cover having upper and lower walls closely spaced to a flexible magnetic disc contained within the cover; a center core attached at a center of said flexible magnetic disc, said center core having a central aperture with a corresponding aperture in the lower wall of said disc cassette positioned for access to said magnetic disc center core; said shaft being positioned through the aperture of said lower wall of the cassette and through the central aperture of said center core, and an end of said shaft abutting against an inner surface of the upper wall of the cassette when the cassette is in an operating position on the driving mechanism; and an anti-wearing member attached at a portion of the inner surface thereof where said end of said shaft is brought in contact therewith.
Claim 2
Dependent Claim
156 words
A magnetic disc cassette formed of a flexible magnetic disc received on a driving mechanism having a shaft associated therewith, comprising: a cover having upper and lower walls closely spaced to a flexible magnetic disc contained within the cover; a center core attached at a center of said flexible magnetic disc, said center core having a central aperture with a corresponding aperture in the lower wall of said disc cassette positioned for access to said magnetic disc center core; said shaft being positioned through the aperture of said lower wall of the cassette and through the central aperture of said center core, and an end of said shaft abutting against an inner surface of the upper wall of the cassette when the cassette is in an operating position on the driving mechanism; and an anti-wearing member attached at a portion of the inner surface thereof where said end of said shaft is brought in contact therewith.
Claim 3
Dependent Claim
31 words
The disc cassette according to claim 1 wherein said anti-wearing member is a sheet made of resin secured at the inner surface of the upper half of the cover by adhesive.
Claim 4
Dependent Claim
18 words
The flexible magnetic disc cassette according to claim 2 wherein said anti-wearing member is a piece of resin.
Claim 5
Dependent Claim
38 words
A magnetic disc cassette according to claim 1 wherein the inner surface of the upper wall where said shaft is brought in contact therewith has a recess in which is received a resin material as said anti-wearing member.
Claim 6
Dependent Claim
35 words
A disc cassette according to claim 4 wherein the recess has a depth chosen such that the resin attached by an adhesive in the recess lies flush with the inner surface of the upper wall.
References Cited (Backward Citations)
US4175274A
Cited
US4419164A
Cited
US4428013A
Cited
US4445157A
Cited
US4414597A
Cited
US4458282A
Cited
US4459628A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |