Inventor · disambiguated record
Daniel A Willoughby
Also filed as: WILLOUGHBY DANIEL A
3 granted patents·22 citations·filing 2011–2011
70Inventor score
Technology areasE21B
Files withWILLOUGHBY DANIEL A3
Top patents by PatentIndex Score
3 records- 0183US8746347B2Subsea wellhead providing controlled access to a casing annulusWILLOUGHBY DANIEL A·Filed 2011·Granted Jun 10, 2014·12 cites·18 claims
- 0278US8678093B2Insertion of a pack-off into a wellheadWILLOUGHBY DANIEL A·Filed 2011·Granted Mar 25, 2014·7 cites·15 claims
- 0366US8544550B2Subsea wellhead with segmented fatigue reduction sleeveWILLOUGHBY DANIEL A·Filed 2011·Granted Oct 1, 2013·3 cites·7 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →