US4549240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Write protection device
Assignee: Verbatim Corp
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Filing: 1982-11-26
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Granted: 1985-10-22
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Expires: 2002-11-26
Abstract
Abstract A magnetic recording disk cartridge has a write control sensing aperture extending through the cartridge. A shutter is mounted within the cartridge for back and forth rotational movement between aperture blocking and aperture opening positions. The shutter is restrained against accidental movement or drift from these positions. The shutter can be assembled locked in a write protect position and must be reassembled to permit movement between the write protect and write enable positions.
Inventors
- 👤 Brian A. Hodges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:45
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/03; G11B23/033; G11B23/0332; G11B23/30
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
111 words
A write protection device comprising a magnetic recording disk cartridge formed by a pair of opposed sides having a write control sensing aperture extending through both sides of the cartridge and including a circular segmental opening in one side of the cartridge, a shutter mounted within the cartridge for arcuate movement back and forth between positions wherein the aperture is either open or blocked by the shutter, and a projection that extends eccentrically from the shutter for cranking the shutter from one position to the other, said projection extending into the circular segmental opening and having surfaces that contact the cartridge for stopping movement of the shutter in the desired positions.
Claim 2
Dependent Claim
111 words
A write protection device comprising a magnetic recording disk cartridge formed by a pair of opposed sides having a write control sensing aperture extending through both sides of the cartridge and including a circular segmental opening in one side of the cartridge, a shutter mounted within the cartridge for arcuate movement back and forth between positions wherein the aperture is either open or blocked by the shutter, and a projection that extends eccentrically from the shutter for cranking the shutter from one position to the other, said projection extending into the circular segmental opening and having surfaces that contact the cartridge for stopping movement of the shutter in the desired positions.
Claim 3
Dependent Claim
32 words
The write protection device of claim 1 wherein said cartridge adjacent the circular segmental opening has a chordal edge that contacts the projection at two locations for stopping movement of the shutter.
Claim 4
Dependent Claim
34 words
The write protection device of claim 2 wherein said cartridge side adjacent the chordal edge at the two locations is beveled to enable engagement of the projection within a plane of the cartridge side.
Claim 5
Dependent Claim
45 words
The write protection device of claim 2 including fine projections and indentations on adjacent sides of the shutter and the cartridge that interfit for retaining the shutter against accidental movement from the two positions wherein the aperture is either open or blocked by the shutter.
Claim 6
Dependent Claim
122 words
A write protection device comprising a magnetic recording disk cartridge formed by a pair of opposed sides having a write control sensing aperture extending through both sides of the cartridge, and a circular segmental opening in one side of the cartridge and an opening opposite the circular segmental opening, mountable within the cartridge between the sides, and a projection that extends eccentrically from the shutter, said shutter and said projection being mountable in a manner for arcuate movement back and forth between positions wherein the aperture is either open or blocked by the shutter and in a reverse manner for locking the shutter in place and blocking the aperture, such projection engaging an edge of the opening opposite the circular segmental opening.
Claim 7
Dependent Claim
122 words
A write protection device comprising a magnetic recording disk cartridge formed by a pair of opposed sides having a write control sensing aperture extending through both sides of the cartridge, and a circular segmental opening in one side of the cartridge and an opening opposite the circular segmental opening, mountable within the cartridge between the sides, and a projection that extends eccentrically from the shutter, said shutter and said projection being mountable in a manner for arcuate movement back and forth between positions wherein the aperture is either open or blocked by the shutter and in a reverse manner for locking the shutter in place and blocking the aperture, such projection engaging an edge of the opening opposite the circular segmental opening.
Claim 8
Dependent Claim
29 words
The write protection device of claim 5 wherein said projection fits tightly within the opening opposite the circular segmental opening, locking the shutter in place and blocking the aperture.
Claim 9
Dependent Claim
21 words
The write protection device of claim 6 wherein said write control sensing aperture and said projection have generally square cross-sectional shapes.
Claim 10
Dependent Claim
39 words
The write protection device of claim 5 wherein said projection extends into the circular segmental opening for cranking the shutter in arcuate movement back and forth between positions wherein the aperture is either open or blocked by the shutter.
Claim 11
Dependent Claim
46 words
The write protection device of claim 8 wherein said cartridge adjacent the circular segmental opening has a chordal edge, and said projection has surfaces that contact the chordal edge of the cartridge for stopping movement of the shutter in either the open or blocked aperture positions.
Claim 12
Dependent Claim
44 words
The write protection device of claim 8 including fine projections and indentations on adjacent sides of the shutter and the cartridge that interfit for retaining the shutter against movement from the two positions wherein the aperture is either open or blocked by the shutter.
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) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |