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Winchester, United Kingdom

Leonard J Rigbey

Average Co-Inventor Count = 2.00

ph-index = 2

The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.

Forward Citations = 25

Leonard J RigbeyMichael R Hatchett (2 patents)Leonard J RigbeyDavid MacWilliams (1 patent)Leonard J RigbeyLeonard J Rigbey (3 patents)Michael R HatchettMichael R Hatchett (9 patents)David MacWilliamsDavid MacWilliams (2 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. International Business Machines Corporation (3 from 164,108 patents)


3 patents:

1. 4508204 - Gravity feed chute

2. 4167269 - Flexible record disk signal storage apparatus

3. 4131199 - Record disk cartridge

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as of
12/7/2025
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