US4521820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insert for blocking operation of the disc write switch in use of computer diskettes
Assignee: Individual
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Filing: 1982-09-30
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Granted: 1985-06-04
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Expires: 2002-09-30
Abstract
Abstract An insert for blocking the disk write arm notch of diskettes used in small computers, in word processors, and in other office machines, comprises an elongate slender insert positioned for sliding movement in the edge portion of the envelope of a diskette to block the write-protection notch thereof so that the read-write-erase functions of the machines are prevented from operation, so that accidental erasure or writing over of previously stored information will not occur. The insert is pushed in to block the notch, and withdrawn to unblock the notch, and may be shaped, colored, or otherwise distinctive in appearance at its outer end to identify the diskette.
Inventors
- 👤 James D. Fann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:59
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/03; G11B23/0301; G11B23/0302; G11B23/0303; G11B19/00; G11B19/02; G11B19/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
248 words
A computer diskette, for use in a computer having a disc drive slot with a door closing the entrance thereto and a disc drive write switch arm adjacent one end of said entrance which controls the read-write-erase function by following into an edge slot adjacent to one corner of said diskette, comprising a single, thin, flat circular recording disc of magnetic material, a thin, flat envelope, having an enlarged central opening, enclosing and supporting said disc for rotary movement therein, said envelope having a notch in one edge portion, adjacent to one corner thereof, adapted to be positioned with said notch at said one end of said entrance and normal thereto, for entrance of the computer disc drive write switch arm thereinto, permitting movement of such switch arm to a selected position permitting the computer to write to the diskette, a slide strip slidably positioned within said one edge portion substantially coplanar with said envelope and having an outer end portion, extending into said drive slot entrance when positioned in said drive slot, said outer end portion being positioned to be grasped for manual operation from outside the computer disc slot when said diskette is positioned therein for computer operation, said strip being manually movable longitudinally to one position extending through and blocking said notch and to another position opening said notch said outer end portion extending into said drive slot entrance when in said open position and providing a visual indication that said notch is not write-protected.
Claim 2
Dependent Claim
248 words
A computer diskette, for use in a computer having a disc drive slot with a door closing the entrance thereto and a disc drive write switch arm adjacent one end of said entrance which controls the read-write-erase function by following into an edge slot adjacent to one corner of said diskette, comprising a single, thin, flat circular recording disc of magnetic material, a thin, flat envelope, having an enlarged central opening, enclosing and supporting said disc for rotary movement therein, said envelope having a notch in one edge portion, adjacent to one corner thereof, adapted to be positioned with said notch at said one end of said entrance and normal thereto, for entrance of the computer disc drive write switch arm thereinto, permitting movement of such switch arm to a selected position permitting the computer to write to the diskette, a slide strip slidably positioned within said one edge portion substantially coplanar with said envelope and having an outer end portion, extending into said drive slot entrance when positioned in said drive slot, said outer end portion being positioned to be grasped for manual operation from outside the computer disc slot when said diskette is positioned therein for computer operation, said strip being manually movable longitudinally to one position extending through and blocking said notch and to another position opening said notch said outer end portion extending into said drive slot entrance when in said open position and providing a visual indication that said notch is not write-protected.
Claim 3
Dependent Claim
25 words
A diskette according to claim 1 in which said slide strip outer end portion has a distinctive appearance for indicating the type of program thereon.
Claim 4
Dependent Claim
120 words
A diskette according to claim 1 in which said envelope is of folded construction with a front layer and a back layer and having edge flaps bent from one layer over the other layer and bonded thereto, said notch being in one of said edge flaps, said one edge flap having a longitudinally extending passage defined by the rebent edge thereof and the bonded portions thereof and open at one end at an adjcent edge of said envelope, said slide strip being of a thin flat elongated material slidably positioned in said passage and having said outer end portion extending outside said passage said strip having longitudinal movement in said passage by manual operation of said extending outer end portion.
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) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |