Priority Date: 26.11.13 (US 201361908844P)

Differential pressure indicator for downhole isolation valve

  • Application ID: EP14194019
  • Status: Request for examination was made


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This EP application has the IPC class E21 (EARTH OR ROCK DRILLING; MINING). Marks & Clerk LLP is specialized in E21. Marks & Clerk LLP is specialised in E21 (EARTH OR ROCK DRILLING; MINING). Here you find a list of all patent agent firms which are specialized in this IPC class. For a similar patent, they might be a good choice.


  • 26.11.2013 - Priority Date (US 201361908844P)
  • 27.05.2015 - Publication A2 (EP2876253)
  • 02.08.2017 - Publication A3 (EP2876253)

IPC Classification