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Loughton, United Kingdom

David M Dronsfield

Average Co-Inventor Count = 1.00

ph-index = 3

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 = 40

David M DronsfieldDavid M Dronsfield (5 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Printed Forms Equipment Ltd. (5 from 9 patents)


5 patents:

1. 5904644 - Envelope closer

2. 5487254 - Apparatus for inserting material into envelopes

3. 5425533 - Apparatus for assembly of a plurality of items of insert material into

4. 5406771 - Apparatus for inserting material into envelopes

5. 5327701 - Apparatus for inserting material into envelopes

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as of
12/20/2025
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