Growing community of inventors

Madrid, Spain

Angel Sierra Calvo

Average Co-Inventor Count = 6.00

ph-index = 1

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 = 80

Angel Sierra CalvoScott D Hultzman (1 patent)Angel Sierra CalvoKurt L Businger (1 patent)Angel Sierra CalvoChristopher Collins (1 patent)Angel Sierra CalvoKevin Romano (1 patent)Angel Sierra CalvoDana Letiecq (1 patent)Angel Sierra CalvoAngel Sierra Calvo (1 patent)Scott D HultzmanScott D Hultzman (14 patents)Kurt L BusingerKurt L Businger (5 patents)Christopher CollinsChristopher Collins (3 patents)Kevin RomanoKevin Romano (3 patents)Dana LetiecqDana Letiecq (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Gtech Rhode Island Corporation (1 from 45 patents)

2. Organización National De Ciegos Españoles (1 from 1 patent)


1 patent:

1. 7590950 - Mobile lottery terminal including features facilitating use by visually impaired ticket agents

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as of
12/14/2025
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