Perpetuation of information in magnetically recorded medium

Claim 1

A method for perpetuating information in a magnetically recorded medium, in which a support bearing a zone of ferromagnetic particles substantially homogeneously distributed in a layer of substantially uniform thickness, firm, softenable plastic carrier has been written upon with a series of spatially discrete magnetic pulses, said method comprising: (a) softening the plastic carrier sufficiently to permit relative translational movement of said particles, whereby relative translational movement will occur due to magnetic forces among the particles, causing local non-uniformities in the homogeneity of distribution of said particles, in a pattern which mimics in said zone said series of spatially discrete magnetic pulses; and (b) hardening and irreversibly setting the plastic carrier to preserve said pattern, whereby, even if said zone were to be degaussed, the information that was recorded in a series of spatially discrete magnetic pulses can thereafter be retrieved at will, by remagnetizing the zone and magnetically reading said pattern of local non-uniformities.

Claim 2

A method for perpetuating information in a magnetically recorded medium, in which a support bearing a zone of ferromagnetic particles substantially homogeneously distributed in a layer of substantially uniform thickness, firm, softenable plastic carrier has been written upon with a series of spatially discrete magnetic pulses, said method comprising: (a) softening the plastic carrier sufficiently to permit relative translational movement of said particles, whereby relative translational movement will occur due to magnetic forces among the particles, causing local non-uniformities in the homogeneity of distribution of said particles, in a pattern which mimics in said zone said series of spatially discrete magnetic pulses; and (b) hardening and irreversibly setting the plastic carrier to preserve said pattern, whereby, even if said zone were to be degaussed, the information that was recorded in a series of spatially discrete magnetic pulses can thereafter be retrieved at will, by remagnetizing the zone and magnetically reading said pattern of local non-uniformities.

Claim 3

A method for perpetuating information in a magnetically recorded medium, comprising: (a) providing a support bearing a zone of ferromagnetic particles substantially homogeneously distributed in a layer of substantially uniform thickness, firm, softenable plastic carrier which has been written upon with a series of spatially discrete magnetic pulses, (b) softening the plastic carrier sufficiently to permit relative translational movement of said particles, whereby relative translational movement will occur due to magnetic forces among the particles, causing local non-uniformities in the homeneity of distribution of said particles, in a pattern which mimics in said zone said series of spatially discrete magnetic pulses; and (c) hardening and irreversibly setting the plastic carrier to preserve said pattern, whereby, even if said zone were to be degaussed, the information that was recorded in the series of spatially discrete magnetic pulses can thereafter be retrieved at will, by remagnetizing the zone and magnetically reading said pattern of local non-uniformities.

Claim 4

A method for perpetuating information in a magnetically recorded medium, comprising: (a) providing a support bearing a zone of ferromagnetic particles substantially homogeneously distributed in a layer of substantially uniform thickness, firm, softenable plastic carrier which has been written upon with a series of spatially discrete magnetic pulses, (b) softening the plastic carrier sufficiently to permit relative translational movement of said particles, whereby relative translational movement will occur due to magnetic forces among the particles, causing local non-uniformities in the homeneity of distribution of said particles, in a pattern which mimics in said zone said series of spatially discrete magnetic pulses; and (c) hardening and irreversibly setting the plastic carrier to preserve said pattern, whereby, even if said zone were to be degaussed, the information that was recorded in the series of spatially discrete magnetic pulses can thereafter be retrieved at will, by remagnetizing the zone and magnetically reading said pattern of local non-uniformities.

Claim 7

A method for generating a magnetic stencil, useful for making analogs of the stencil, comprising: (a) magnetically writing on a zone of ferromagnetic particles homogeneously distributed in a uniformly distributed layer of largely uncured, somewhat fluid plastic material, (b) permitting the said particles written upon and not written upon to move translationally in said layer relative to one another in tending to reduce magnetic force concentrations induced in said zone ancillary to conducting step (a); and (c) substantially curing said plastic material to preserve a set condition wherein the particle movement of step (b) has produced a physical analog of the magnetic writing of step (a), in order to thereby create of said zone a magnetic stencil which, even if degaussed, will, when remagnetized be magnetically readable due to the set movement of the ferromagnetic particles into localized areas of greater and lesser concentration which analog the magnetic writing of step (a).

Claim 8

A method for generating a magnetic stencil, useful for making analogs of the stencil, comprising: (a) magnetically writing on a zone of ferromagnetic particles homogeneously distributed in a uniformly distributed layer of largely uncured, somewhat fluid plastic material, (b) permitting the said particles written upon and not written upon to move translationally in said layer relative to one another in tending to reduce magnetic force concentrations induced in said zone ancillary to conducting step (a); and (c) substantially curing said plastic material to preserve a set condition wherein the particle movement of step (b) has produced a physical analog of the magnetic writing of step (a), in order to thereby create of said zone a magnetic stencil which, even if degaussed, will, when remagnetized be magnetically readable due to the set movement of the ferromagnetic particles into localized areas of greater and lesser concentration which analog the magnetic writing of step (a).