GB2240423A - Security device for floppy disc drive - Google Patents
Security device for floppy disc drive Download PDFInfo
- Publication number
- GB2240423A GB2240423A GB9102050A GB9102050A GB2240423A GB 2240423 A GB2240423 A GB 2240423A GB 9102050 A GB9102050 A GB 9102050A GB 9102050 A GB9102050 A GB 9102050A GB 2240423 A GB2240423 A GB 2240423A
- Authority
- GB
- United Kingdom
- Prior art keywords
- floppy disc
- projection
- disc drive
- security device
- engagement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 230000001419 dependent effect Effects 0.000 claims 1
- 229920003023 plastic Polymers 0.000 abstract description 3
- 239000004033 plastic Substances 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 abstract 3
- 230000037431 insertion Effects 0.000 abstract 1
- 238000003780 insertion Methods 0.000 abstract 1
- 241000700605 Viruses Species 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/005—Means for locking the disc or cassette receiving slot, e.g. dummy cassettes locked in the slot
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
- G11B23/03—Containers for flat record carriers
- G11B23/0327—Containers for flat record carriers for special applications not otherwise provided for
Landscapes
- Feeding And Guiding Record Carriers (AREA)
Abstract
A lockable security device (5, 6) for a floppy disc drive (1, 8, 9) comprises a plastics moulding (5) which includes a lock (52) for engaging a slidable plate member (6) which carries a downwardly and rearwardly extending projection (63) on its lower surface. When the lock (52) is unlocked the plate member (6) can be slid forwardly to raise the projection (63) by engagement with the forward edge of an aperture (56) formed in the lower moulding (5). The device can then be slid into the slot of a floppy disc drive and on sliding plate member (6) rearwardly (in the direction of arrow B) the projection (63) swings downwardly and engages the inner periphery of the drum (9) of the floppy disc drive. The device can be locked in this configuration to prevent its withdrawal and thereby prevent the unauthorised insertion of a floppy disc into the drive. The device can be withdrawn by unlocking the lock (52) and subsequently withdrawing the lower moulding (5) rearwardly in the direction of arrow B. The projection may engage different parts of the drum, depending on the size of the disc drive. <IMAGE>
Description
Security Device for Floppy Disc Drive
The present invention relates to a lockable security device for preventing the unauthorised loading of a floppy disc into a floppy disc drive.
A known device of this type is shown in Figure 1 and comprises a body shell 2 which partially encloses a lock (not shown). A shaft 3 can be rotated by means of a key to engage a projection on the shaft with an inner edge of a lip in a front panel 1 of a floppy disc slot. The projection can be locked in this position and after removing the key from the device, cannot be removed from the floppy disc slot except by an authorised person with the appropriate key. A security device of this type is highly desirable in many computer installations since there is otherwise a risk that sensitive data (stored for example on a hard disc of the computer) could be copied by an unauthorised person onto a floppy disc. Furthermore, there is a risk that a 'virus' could be loaded onto the hard disc of the computer from a floppy disc which is inserted into the computer's floppy disc drive.
However, the device described above has the advantage that it is suitable for protecting only those floppy disc drives which have a front panel of a cross section closely similar to that shown in Figure 1.
This is because the profile of the locking device 2 must be complementary to the front profile of the front panel 1 in order to enable the projection 3 to engage the inner surface of the slot periphery.
Unfortunately, the profile of the front panel of a floppy disc drive varies widely depending upon the manufacturer. Furthermore, in many cases it is possible to remove the front panel entirely and thereby gain access to the floppy disc drive.
An object of the present invention is to overcome or alleviate the above disadvantages.
Accordingly the invention provides a lockable security device for preventing the unauthorised loading of a floppy disc into a floppy disc drive, the device having an unlocked configuration in which it retractable from the floppy disc slot of a floppy disc drive and having a locked configuration in which an engaging member of the device is engageable with the interior of the floppy disc drive to prevent the device from being retracted from the floppy disc slot, characterised in that the engaging member is so located and dimensioned that, in use, in the locked configuration of the device the engaging member engages the drum assembly of the floppy disc drive, at least on attempting to withdraw the device from the slot.
The security device of the present invention has the advantage that it is compatible with a wide range of floppy disc drives for any given type of floppy disc (eg "3 1/2 inch" (89 mm) or "5 1/4 inch" (133mm)) since the drum assembly of a floppy disc drive must be compatible with a standard floppy disc of the type for which the drive is intended, irrespective of the manufacturer.
Furthermore, since the security device of the present invention engages an interior component of the floppy disc drive rather than an external panel, the device cannot be circumvented by removing the front panel of the drive.
For use with a 133 mm (5 1/4 inch) floppy disc drive, preferably the engaging member comprises a movable projection which is engageable with the inner periphery of the drum of a 115 1/4 inch" disc drive and is retractable from engagement with the inner periphery on unlocking the device to enable the device to be removed from the drive.
For use with an 89 mm (34 inch) floppy disc drive, preferably the engaging member comprises a movable projection which is engageable with the spindle of a 1134 inch" floppy disc drive and is retractable from engagement with the spindle on unlocking the device to enable the device to be removed from the drive.
For use with an alternative form of an 89 mm (34 inch) floppy disc drive preferably the engaging member comprises a movable projection which is engageable with a radially outwardly facing peripheral surface of the drum of a 1134 inch" floppy disc drive and is retractable from engagement with the surface on unlocking the device to enable the device to be removed from the drive.
Preferably, a security device comprises two relatively movable members one of which carries a projection which projects rearwardly towards the floppy disc slot and is biased into engagement with the drum assembly when the device is inserted in a floppy disc drive the other movable member being engageable with the projection to move it out of engagement with the drum assembly on unlocking the device.
More preferably, one of the relatively movable members is in the form of a plate and in use the projection extends downwardly and rearwardly from the plate, the projection being liftable out of engagement with the drum assembly by engagement with the other relatively movable member when the device is unlocked.
Yet more preferably, the other of the relatively movable members has an opening (56;56') through which the projection extends, the other relatively movable member being mounted against the plate and being slidable rearwardly when the device is unlocked to engage the projection with an edge of the opening and thereby lift the projection out of engagement with the drum assembly.
The plate may be generally rectangular and of a width such that in use, it occupies substantially the entire length of a standard floppy disc slot (S).
A security device in accordance with the present invention may incorporate an integral lock, and in a device having the above-mentioned movable members, preferably the lock is mounted on the other movable member and has a barrel which is engageable with the plate to lock it in position.
Preferred embodiments of the invention will now be described by way of example only with reference to
Figures 2 to 5 of the accompanying drawings, of which:
Figure 1 is a side elevation, partly in section showing a security device of a known type attached to the front panel of the floppy disc drive;
Figure 2 is an isometric view of a lockable security device in accordance with a present invention in conjunction with the front panel of 115 1/4 inch" floppy disc drive;Figure 3 is a partial cross section taken on Ill-Ill of Figure 2 showing the security device inserted in a floppy disc drive;
Figure 4 is a partial cross section similar to that of
Figure 3 but showing a further embodiment of the present invention which is suitable for protecting a 113 1/2 inch" floppy disc drive, and
Figure 5 is a bottom plan view of the security device of Figure 4.
Throughout the drawings, similar parts are designated by common reference numerals.
Figure 1 has already been referred to and will not be described in further detail.
Referring to Figure 2, the lockable security device 20 shown in the drawing comprises two relatively movable members, namely an upper plate member 6 which carries a resilient projection 63 in a central cut-out portion thereof and a lower member 5 which carries a ledge 51 on which the plate member 6 is slidable. It will be sent that the ledge 51 extends forwardly from a handle portion 54, which in turn incorporates an integral tumbler lock 52. An aperture 56 is formed in ledge 51 and projection 63 extends downwardly and rearwardly through this aperture as is shown more clearly in
Figure 3. The two members 5 and 6 can be locked in this configuration by means of the lock 52 which engages a recess in a rearward projection 65 from plate member 6 with its barrel 55 (Figure 3 - not shown in Figure 2).Projection 65 and opposite projection 64 (Figure 2) both slide underneath the upper portion of handle 54 adjacent to lock 52 as shown in Figure 3. Tumbler lock 52 is operated in a conventional manner by a removable key 4. However, on sliding plate member 6 forwardly (in the direction of arrow A in Figure 2) with respect to member 5, the front edge of aperture 56 engages the lower surface of projection 63 and lifts it such that it no longer projects through the aperture.
In order to guide the members 5 and 6 and to prevent them from separating, guide tabs 63 are attached to the side portions of the upper surface of ledge 51 and are accommodated within apertures 61 in upper plate member 6. The lower surface of the projecting portion of each guide tab 53 bears against the upper surface of a ledge 62 which projects inwardly towards the adjacent side of ledge 51 from the lower surface of plate member 6. When the plate member 6 is slid forwardly (ie in the direction of arrow A) to raise projection 62 (which involves unlocking the device with key 4) the entire device 20 can be slid forwardly in the direction of arrow A into the slot S of "5 1/4 inch disc drive, only the front panel 1 and handle 7 being shown in Figure 2.
The upper plate member 6 can then be slid rearwardly (ie in the direction of arrow B) to release the projection 63 which swings downwardly to engage the inner periphery of the floppy disc drum 9 by virtue of its natural resilience. The device can then be locked in this configuration as shown in Figure 3. In order to provide the necessary resilience for projection 63, and to avoid any danger of short circuits members 5 and 6 are both composed of resilient plastics material, such as ABS.
It should be noted that in normal use of the floppy disc drive, the hub of the floppy disc is gripped between the upper surface of drum 9 and a ridge 81 which is formed around the periphery of an array of plastics spring fingers 8. Array 8 is lowered onto the floppy disc drive by means of control handle 7 (Figure 2) as is well known. Since the hub of a 115 1/4 inch" floppy disc has a standard diameter, the diameter of the inner periphery of the drum 9 is also standard, and hence the position of this periphery with respect to the front panel 1 of the floppy disc drive varies only within narrow limits, irrespective of the manufacturer. Accordingly, the location of the projection 63 and the critical dimensions of the members 5 and 6 are determined largely by the standard dimensions of a 133 mm (5 1/4 inch) floppy disc.
Furthermore, any slight mismatch between the inner edge of lock 52 (which engages the frontpanel 1) and the inner edge of projection 63 (which engages the inner periphery of drum 9) on the one hand and the distance between the drum 9 and the outside of front panel 1 on the other, can be accommodated by the resilience of projection 63. In any case it is not essential that the tip of projection 63 should actually touch the interior of drum 9 when the device is fully inserted into the floppy disc drive. The projection 63 should engage the drum and thereby prevent complete withdrawal of the device when the device is partially withdrawn in the direction of arrow B as shown in Figure 3.
An authorised user can remove the security device by unlocking lock 52 with key 4 and then withdrawing number 5 in the direction of arrow B which causes the front edge (shown on the left in Figure 3) of aperture #56 to engage the lower surface of the root portion of projection 63 and flip projection 63 upwards over the rim of drum 9 in the direction of arrow C as shown in
Figure 3. The projection 63 is then accommodated within aperture 56 and the device can be retracted through the floppy disc slot in front panel 1.
It is noted in passing that a further longitudinal guide 66 is formed in the lower surface of plate member 6 and slides in a longitudinal slot which is formed in ledge 51.
As is well known, a standard 1134 inch" floppy disc drive incorporates a mechanism which automatically lowers an inserted floppy disc onto the drum assembly.
Such a mechanism is represented schematically by jaws in Figure 4 which shows a second embodiment of a lockable security device in accordance with the present invention, which is suitable for protecting a 1134 incht floppy disc drive. Many of the features of this embodiment are very similar to the corresponding features of the embodiment shown in Figures 2 and 3 and have been merely represented by primed reference numerals without further description. However, it should be noted that projection 63' of this embodiment engages spindle 11 of the drum 9' when the device is inserted in the floppy disc drive. In a variant of this embodiment (projection 63' is omitted), an alternative projection 63'' (shown in dashed lines) is arranged to engage the outer periphery of the drum 9'.
In each case, the projection 63' or 63'' can be released from its engagement with the spindle or drum respectively by withdrawing member 5'. In order to facilitate this, the tip of projection 63' is preferably profiled so as to clear the tip of spindle 11 when it is raised by withdrawal of the member 5'.
However, any attempt to withdraw the device when the two members 5' and 6' are locked together by lock 52' merely focus the projection 63' or (63'') against the spindle 11 (or drum 9' ) and the projection cannot ride over these obstacles. In fact any determined attempt to withdraw the device without unlocking it would probably damage the drive.
The underside of the device 20' of Figure 4 is shown more clearly in Figure 5. It will be seen that ledge 51' is generally in the from of an inverted T and that the stem of the T slides between projections 67 from a strengthening rib 69 which is formed around the periphery of upper plate member 6'. The handle portion 54' of member 5' incorporates an aperture which accommodates a generally U-shaped portion of plate member 6', the legs of the U being labelled 64' and 65'. The latter incorporates a recess which accommodates a portion 55' of the barrel of lock 52' (Figure 4). An aperture 70 is formed in the stem portion of ledge 51' and guides projection 66' which is integral with plate number 6' as shown in Figure 4.
The resilient projection 63' is shown extending through aperture 56'.
It will be seen that upper plate member 6' incorporates a rectangular recess 68 in its front portion. This recess ensures that the device does not engage the standard mechanism (not shown) of a 1134 inch" floppy disc drive which engages the protective slide of a standard 89 mm (34 inch) floppy disc to expose the surface of the rotating medium.
Claims (11)
1. A lockable security device (20; 20') for
preventing the unauthorised loading of a floppy
disc into a floppy disc drive, the device having
an unlocked configuration in which it is
retractable from the floppy disc slot(s) of a
floppy disc drive (1,7,8,9,10,11) and having a
locked configuration in which an engaging member
(63;63' ) of the device is engageable with the
interior of the floppy disc drive to prevent the
device from being retracted from the floppy disc
slot, characterised in that said engaging member (63; 63' ) is so located and dimensioned that, in
use, in the locked configuration of the device
(20; 20') the engaging member engages the drum
assembly (8,9) of the floppy disc drive (1,7,8,9,10,11) at least on attempting to
withdraw the device from said slot(s).
2. A security device (20) as claimed in claim 1
which is suitable for preventing the
unauthorised loading of a 133 mm (5 1/4 inch)
floppy disc wherein said engaging member
comprises a movable projection (63) which is
engageable with the inner periphery of the drum
(9) of a "5 1/4 inch" disc drive and is
retractable from engagement with said inner
periphery on unlocking the device (20) to enable
the device to be removed from the drive
(1,7,8,9).
3. A security device (20' ) as claimed in claim 1
which is suitable for preventing the
unauthorised loading of an 89 mm (34 inch)
floppy disc wherein said engaging member
comprises a movable projection (63' ) which is
engageable with the spindle (11) of a 1134 inch"
floppy disc drive (1,7,8,9',10,11) and is
retractable from engagement with said spindle on
unlocking the device to enable the device to be
removed from the drive.
4. A security device (20' ) as claimed in claim 1
which is suitable for preventing the
unauthorised loading of an 89 mm (34 inch)
floppy disc wherein said engaging member
comprises a movable projection (63'' ) which is
engageable with a radially outwardly facing
peripheral surface of the drum (9' ) of a 1134 inch" floppy disc drive (1,7,8,9', 10, 11) and
is retractable from engagement with said surface
on unlocking the device to enable the device to
be removed from the drive.
5. A security device (20; 20' ) as claimed in any
preceding claim with comprises two relatively
movable members (5, 6; 5' 6' ) one of which (6,
6') carries a projection (63;63;63'' ) which
projects rearwardly towards the floppy disc slot
(S) and is biased into engagement with the drum
assembly (9; 9' ) when the device is inserted in
a floppy disc drive (1,7,8,9,/9',10,11) the
other movable member (5; 5') being engageable
with said projection to move it out of
engagement with said drum assembly on unlocking
the device.
6. A security device (20; 20' ) as claimed in claim
5 wherein one of said relatively movable members
is in the form of a plate (6;6') and in use said
projection (63;63') extends downwardly and
rearwardly from said plate, said projection
being liftable out of engagement with said drum
assembly (8, 9/9') by engagement with the other
relatively movable member (5; 5') when the device (20; 20' ) is unlocked.
7. A security device (20; 20' ) as claimed in claim
6 wherein the other of said relatively movable
members (5;5') has an opening (56;56') through
which said projection extends, said other
relatively movable member being mounted against
said plate (6; 8') and being slidable rearwardly
when the device is unlocked to engage said
projection (63; 63' ) with an edge of said opening
and thereby lift said projection out of
engagement with said drum assembly (8, 9/9' ).
8. A security device (20; 20' ) as claimed in claim
6 or claim 7 wherein said plate (6;6' ) is
generally rectangular and of a width such that
in use, it occupies substantially the entire
length of a standard floppy disc slot (S).
9. A security device (20;20' ) as claimed in any
preceding claim which incorporates an integral
lock (52,55;52', 55').
10. A security device (20; 20' ) as claimed in claim
9 as dependent upon any of claims 6, 7 and 8
wherein said lock (52, 55; 52', 55' ) is mounted on
said other movable member (5; 5') and has a
barrel (55; 55') which is engageable with said
plate (6; 6' ) to lock it in position.
11. A lockable security device for preventing
the unauthorised loading of a floppy disc
into floppy disc drive, and substantially
as herein described with reference to
Figures 2 and 3, or Figures 2 and 3 when
modified by Figures 4 and 5, of the
drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB909002070A GB9002070D0 (en) | 1990-01-30 | 1990-01-30 | Security device for floppy disc drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9102050D0 GB9102050D0 (en) | 1991-03-13 |
| GB2240423A true GB2240423A (en) | 1991-07-31 |
Family
ID=10670126
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB909002070A Pending GB9002070D0 (en) | 1990-01-30 | 1990-01-30 | Security device for floppy disc drive |
| GB9102050A Withdrawn GB2240423A (en) | 1990-01-30 | 1991-01-30 | Security device for floppy disc drive |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB909002070A Pending GB9002070D0 (en) | 1990-01-30 | 1990-01-30 | Security device for floppy disc drive |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB9002070D0 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0500051A2 (en) * | 1991-02-18 | 1992-08-26 | Siemens Nixdorf Informationssysteme Aktiengesellschaft | Device for locking the receiving compartment of a data carrier unit, e.g. a discette |
| GB2253511A (en) * | 1991-02-18 | 1992-09-09 | John Hermann Eschenburg | Protection device |
| WO1993020559A1 (en) * | 1992-04-07 | 1993-10-14 | Hasse Forslund | A disk drive lock |
| FR2691831A1 (en) * | 1992-06-01 | 1993-12-03 | Kappa Micro Sarl | Security diskette for locking disk drives - uses barrel lock mounted on antistatic diskette to turn lever in cone drive space |
| WO1994020711A1 (en) * | 1993-03-04 | 1994-09-15 | Even Jahr | A computer disc station locking device |
| US5630330A (en) * | 1996-06-11 | 1997-05-20 | Tigerex Enterprise Co., Ltd. | Lock for diskette drive |
| US5673573A (en) * | 1994-11-30 | 1997-10-07 | Green; Terence R. | Anti-tamper device for audio and computer devices having cassette or diskette receiving slot |
| EP0806770A1 (en) * | 1996-05-10 | 1997-11-12 | Terence Ronald Green | Anti-tamper device |
| US6053017A (en) * | 1999-07-13 | 2000-04-25 | Ling; Chong-Kuan | Combination lock means for floppy disk drive |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2176232A (en) * | 1985-06-07 | 1986-12-17 | Graham Colin Lane | Security device to prevent access to a floppy disk drive |
| US4856504A (en) * | 1987-10-13 | 1989-08-15 | Vitaphore Corp. | Antimicrobial wound dressing and skin fixator for orthopedic pins |
| WO1989009993A1 (en) * | 1988-04-15 | 1989-10-19 | Blair Electrical Engineering Company Limited | Anti-theft device for an entertainment system |
-
1990
- 1990-01-30 GB GB909002070A patent/GB9002070D0/en active Pending
-
1991
- 1991-01-30 GB GB9102050A patent/GB2240423A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2176232A (en) * | 1985-06-07 | 1986-12-17 | Graham Colin Lane | Security device to prevent access to a floppy disk drive |
| US4856504A (en) * | 1987-10-13 | 1989-08-15 | Vitaphore Corp. | Antimicrobial wound dressing and skin fixator for orthopedic pins |
| WO1989009993A1 (en) * | 1988-04-15 | 1989-10-19 | Blair Electrical Engineering Company Limited | Anti-theft device for an entertainment system |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0500051A2 (en) * | 1991-02-18 | 1992-08-26 | Siemens Nixdorf Informationssysteme Aktiengesellschaft | Device for locking the receiving compartment of a data carrier unit, e.g. a discette |
| GB2253511A (en) * | 1991-02-18 | 1992-09-09 | John Hermann Eschenburg | Protection device |
| EP0500051A3 (en) * | 1991-02-18 | 1992-09-30 | Siemens Nixdorf Informationssysteme Aktiengesellschaft | Device for locking the receiving compartment of a data carrier unit, e.g. a discette |
| US5268809A (en) * | 1991-02-18 | 1993-12-07 | Eschenburg John H | Protection device for a computer diskette drive |
| WO1993020559A1 (en) * | 1992-04-07 | 1993-10-14 | Hasse Forslund | A disk drive lock |
| FR2691831A1 (en) * | 1992-06-01 | 1993-12-03 | Kappa Micro Sarl | Security diskette for locking disk drives - uses barrel lock mounted on antistatic diskette to turn lever in cone drive space |
| WO1994020711A1 (en) * | 1993-03-04 | 1994-09-15 | Even Jahr | A computer disc station locking device |
| US5673573A (en) * | 1994-11-30 | 1997-10-07 | Green; Terence R. | Anti-tamper device for audio and computer devices having cassette or diskette receiving slot |
| GB2296597B (en) * | 1994-11-30 | 1998-10-28 | Terence Ronald Green | Anti-tamper device |
| EP0806770A1 (en) * | 1996-05-10 | 1997-11-12 | Terence Ronald Green | Anti-tamper device |
| US5630330A (en) * | 1996-06-11 | 1997-05-20 | Tigerex Enterprise Co., Ltd. | Lock for diskette drive |
| US6053017A (en) * | 1999-07-13 | 2000-04-25 | Ling; Chong-Kuan | Combination lock means for floppy disk drive |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9002070D0 (en) | 1990-03-28 |
| GB9102050D0 (en) | 1991-03-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |