Apparatus and method for managed pressure drilling

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 8631874
APP PUB NO 20110108282A1
SERIAL NO

12985867

Stats

ATTORNEY / AGENT: (SPONSORED)

Importance

Loading Importance Indicators... loading....

Abstract

See full text

A drilling system employing a main tubular having a plurality of fluid inlet and outlet conduits positioned thereon and a concentric inner tubular having a plurality seals for sealing the annular space between the concentric inner and main tubulars. The fluid inlet and outlet conduits work in cooperation with the annular seals to selectively open and close for effective management of pressure within the tubulars.

Loading the Abstract Image... loading....

First Claim

See full text

Family

Loading Family data... loading....

Patent Owner(s)

  • TRANSOCEAN OFFSHORE DRILLING;TRANSOCEAN SEDCO FOREX VENTURES LIMITED

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Black, Sandy Cupar, GB 2 93
Juran, Tim Cypress, US 2 93
Kozicz, John Spring, US 11 144
Legault, Andy Houston, US 2 93
Mackay, John Inverurie, GB 31 598
Niven, Scott Aberdeen, GB 2 93
Sneddon, Iain Scotland, GB 2 93

Cited Art Landscape

Load Citation

Patent Citation Ranking

Forward Cite Landscape

Load Citation

Maintenance Fees

Fee Large entity fee small entity fee micro entity fee due date
11.5 Year Payment $7400.00 $3700.00 $1850.00 Jul 21, 2025
Fee Large entity fee small entity fee micro entity fee
Surcharge - 11.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge after expiration - Late payment is unavoidable $700.00 $350.00 $175.00
Surcharge after expiration - Late payment is unintentional $1,640.00 $820.00 $410.00