Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Access valve for drill stem testing

Access valve for drill stem testing

US Patent 4278130 · Granted Jul 14, 1981

Estimated economic value: $45,646,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Sequences for detection and identification of methicillin-resistant Staphylococc2023
Float valve insert2023
Stage cementing system2023
Catcher for dropped objects2023
Float valve insert2023
Stage tool having composite seats2022
Stage cementing system2021
Plug system2021
Buoyant system for installing a casing string2021
Buoyant system for installing a casing string2020
Telemetry operated tools for cementing a liner string2020
Flow control device2020