Multilayer core memory process

Claim 1

The method of forming a core memory board which comprises the steps of providing a layer of conductor upon a layer of insulating material, etching said layer of conductor to form horizontal and vertically extending conducting portions, mounting a plurality of cores each surrounding at least two of said vertically extending portions, applying insulating material to hold said cores in position, electroplating conducting material to complete the pattern of conductors, and applying a coating of insulating material to form a monolithic structure.

Claim 2

The method of forming a core memory board which comprises the steps of providing a layer of conductor upon a layer of insulating material, etching said layer of conductor to form horizontal and vertically extending conducting portions, mounting a plurality of cores each surrounding at least two of said vertically extending portions, applying insulating material to hold said cores in position, electroplating conducting material to complete the pattern of conductors, and applying a coating of insulating material to form a monolithic structure.

Claim 3

The method of forming a core memory board which comprises the steps of providing a layer of conductor upon a layer of insulating material, etching said layer of conductor to form horizontal and vertical conducting portions, providing a plurality of cores secured to a sheet of insulating material, mounting said sheet carrying said cores with said cores surrounding parts of said vertical conducting portions, filling in spaces with insulating material, electroplating conducting material to complete the pattern of conductors, and applyIng a coating of insulating material to form a monolithic structure.

Claim 4

The method of forming a core memory board which comprises the steps of providing a layer of conductor upon a layer of insulating material, etching said layer of conductor to form horizontal and vertical conducting portions, providing a plurality of cores secured to a sheet of insulating material, mounting said sheet carrying said cores with said cores surrounding parts of said vertical conducting portions, filling in spaces with insulating material, electroplating conducting material to complete the pattern of conductors, and applyIng a coating of insulating material to form a monolithic structure.

Claim 5

The method of forming a core memory board which comprises the steps of etching one side of a conductor plate to leave projecting pairs of pillars, placing one magnetic material core around each of said pairs of pillars, applying insulating material securing said cores in place, depositing a layer of conductor over said insulating material and said pillars, etching both sides of said conductor plate to leave projecting pillars, etching a different pattern to leave an inner layer of conductors joining preselected pillars, applying insulating material over said conductors, depositing conductor over said insulating material, and etching said conductor to leave an outer layer of conductors joining other preselected pillars.

Claim 6

The method of forming a core memory board which comprises the steps of etching one side of a conductor plate to leave projecting pairs of pillars, placing one magnetic material core around each of said pairs of pillars, applying insulating material securing said cores in place, depositing a layer of conductor over said insulating material and said pillars, etching both sides of said conductor plate to leave projecting pillars, etching a different pattern to leave an inner layer of conductors joining preselected pillars, applying insulating material over said conductors, depositing conductor over said insulating material, and etching said conductor to leave an outer layer of conductors joining other preselected pillars.

Claim 8

The method of forming a magnetic core memory board which comprises the steps of laminating a sheet of magnetic metal to a layer of insulating material, coating said metal with a light-sensitive resist, exposing said resist except in areas to form the openings in said cores, developing said resist, removing the unexposed resist, etching said magnetic metal to form the inner openings in said cores, securing said etched core-forming metal to an insulating board with at least two conductors projecting through each of the openings in said core-forming metal sheet and then etching said magnetic metal again to define the outside diameter of said cores.

Claim 9

The method of forming a magnetic core memory board which comprises the steps of laminating a sheet of magnetic metal to a layer of insulating material, coating said metal with a light-sensitive resist, exposing said resist except in areas to form the openings in said cores, developing said resist, removing the unexposed resist, etching said magnetic metal to form the inner openings in said cores, securing said etched core-forming metal to an insulating board with at least two conductors projecting through each of the openings in said core-forming metal sheet and then etching said magnetic metal again to define the outside diameter of said cores.

Claim 10

The method of forming a core memory assembly which comprises the steps of etching a first layer of conductive material to form a first group of horizontally and vertically extending conductors, applying to said layer a first coat of insulating material so as to cover said horizontally extending conductors but to leave a portion of said vertically extending conductors exposed, applying a second layer of conductive material to said coat, etching said second layer to form a second group of horizontally and vertically extending conductors, applying a second coat of insulating material so as to cover said horizontally extending conductors of said second group but to leave a portion of all of said vertically extending conductors exposed, mounting a plurality of magnetic memory cores so that each core encircles at least one vertically extending conductor of each of said first and second groups, applying a third coat of insulating material so as to cover and retain said cores, and forming electrical circuitry interconnecting said vertically extending conductors of both groups.

Claim 11

The method of forming a core memory assembly which comprises the steps of etching a first layer of conductive material to form a first group of horizontally and vertically extending conductors, applying to said layer a first coat of insulating material so as to cover said horizontally extending conductors but to leave a portion of said vertically extending conductors exposed, applying a second layer of conductive material to said coat, etching said second layer to form a second group of horizontally and vertically extending conductors, applying a second coat of insulating material so as to cover said horizontally extending conductors of said second group but to leave a portion of all of said vertically extending conductors exposed, mounting a plurality of magnetic memory cores so that each core encircles at least one vertically extending conductor of each of said first and second groups, applying a third coat of insulating material so as to cover and retain said cores, and forming electrical circuitry interconnecting said vertically extending conductors of both groups.