IBM and
others filed multiple IBM System/3 related patents.
Here is an overview... (Please email me if you find any additional
ones)
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US3701105 - CPU Architecture of the System/3.
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US3882701 - IBM 5440 Disk cartridge locking latch.
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US3848235 - IBM 5445 Disk drive attachment.
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US3938101 - I /O Architecture of the System/3.
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US3805245 - IBM 5424 Card reader/puncher attachment.
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US3764994 - IBM 5213 Bidirectional printing.
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US3925770 - IBM 541x Audible signaling device.
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US3751041 - Playing cards and 96 column cards.
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US3953094 - IBM 5444 cabinet configuration.
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US3743294 - Bridge hand dealing system and 96 column cards.
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US4093983 - IBM 5415D performance improvement.
[HTML] [PDF] US3990064 - IBM 5203 Alarm Indicator
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US3609305 - Card reader for 80 and 96 column cards.
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US3684164 - IBM 5496 Data card puncher/verifier.
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US3635608 - IBM 5440 Magnetic disk assembly.
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US3871576 - IBM 5496 Data recorder and verifier.
[HTML] [PDF] US3312878 - Packaging of SLT and MST circuit modules.
[HTML] [PDF] US4328544 - Point of sales machine with a S/3 micro-processor.
[HTML] [PDF] US3387286 - IBM MOSFET memory
[HTML] [PDF] US3531106 - IBM 5496 card knife.
[HTML] [PDF] US3534344 - IBM 3340 Winchester disk drive.
[HTML] [PDF] US3609305 - 80 and 96 column card reader.
[HTML] [PDF] US3672297 - IBM 5203 Printer.
[HTML] [PDF] US3676852 - Dual Program Feature for the S/3 mdl 10 & 12.
[HTML] [PDF] US3680054 - I/O Channels of the System/3.
[HTML] [PDF] US3828327 - IBM 5412 DPF memory protection.
[HTML] [PDF] US3872444 - IBM 3270 terminal control unit.
[HTML] [PDF] US3938101 - IBM 5448 Emulating a 5445.