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Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Spx › David Engel
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David Engel — 18 Patents

SPSpx: 6 patents #54 of 468Top 15%
FSFederal Signal: 4 patents #72 of 717Top 15%
Schlumberger Technology: 3 patents #1,967 of 7,293Top 30%
ICInternational Truck Intellectual Property Company: 1 patents #280 of 636Top 45%
Miami, FL: #144 of 4,605 inventorsTop 4%
Florida: #2,710 of 67,251 inventorsTop 5%
Overall (All Time): #245,716 of 4,157,543Top 6%
18 Patents All Time
David Engel has been granted 18 US patents while listed as an inventor at Spx. The first was granted in 1992 and the most recent in November 2025. David Engel ranks #245,716 of 4,157,543 US inventors in our database (top 5.9%). Patent records list David Engel in Miami, FL, US.

Patents per Year

Patents granted per year, 1992 to 2024Bar chart with a peak of 3 patents in 1998.peak 31992: 1 patents19921996: 1 patents1998: 3 patents19982002: 1 patents2004: 1 patents20042005: 3 patents2008: 1 patents20082010: 1 patents2017: 1 patents20172019: 2 patents2024: 2 patents2024

Issued Patents All Time

Showing 1–18 of 18 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
12473788 Downhole tool for automatic tubular cutting Adam Zygmunt Cygan, Joseph Casassa, Michael R. Vince, Todor Sheiretov, Maxim Klyuzhev +3 more 2025-11-18
12098608 Cutting tool and controls for downhole mechanical services Joseph Casassa, Todor Sheiretov, Joshua Wurtz, Albert Dionisio, Robert Kyle Wiesenborn +1 more 2024-09-24 $27,815,000
12084934 Slot cutter system and operations Joshua Wurtz, Joseph Casassa, Christopher Albert Babin, Robert Kyle Wiesenborn, Pierre-Arnaud Foucher +1 more 2024-09-10 $45,537,000
10518700 Instrusion detection system and methods thereof George Engel 2019-12-31
10472901 Electrical wellbore instrument swivel connector April Bohannan, William Rohr 2019-11-12 $26,833,000
9610894 Intrusion detection system and methods thereof George Engel 2017-04-04
7705882 Device and system for enabling families to share in long haul truckers' travels Jaewon Samuel Kang, Shamir Karkal, Timothy C. Simmons, Aubrey Shick 2010-04-27
7407322 Tripod-mounted magnetic mixer apparatus and method — 2008-08-05 $46,782,000
6935771 Mixer seal and bearing apparatus and method — 2005-08-30 $11,233,000
6877750 Drive assembly for a mixer — 2005-04-12 $10,283,000
6843612 Retaining ring apparatus and method — 2005-01-18 $26,601,000
6715913 Shaft bearing support method and apparatus — 2004-04-06 $29,351,000
6457853 Impeller device and method — 2002-10-01 $15,621,000
5842377 Mixer gearbox assembly having a cross-shaft alternatively mounted in one or two bearings and configured to receive different drive motors William J. Hutchings, Stephen L. Markle, Joel S. Berg, Marlin D. Schutte 1998-12-01
5746536 Double taper lock system for a locking a mixer shaft in a quill William F. Hutchings, Marlin D. Schutte, Stephen L. Markle, Joel S. Berg 1998-05-05
5720486 Self-formed labyrinth seal William J. Hutchings, Stephen L. Markle, Joel S. Berg 1998-02-24 $4,107,000
5560709 Mixer drive apparatus enabling radial changing of shaft seal William F. Hutchings, Marlin D. Schutte, Stephen L. Markle, Joel S. Berg 1996-10-01 $9,637,000
D323663 Transmission cover Stephen L. Markle, William F. Hutchings 1992-02-04

Frequent Collaborators

Stephen L. Markle5 shared
Joel S. Berg4 shared
Todor Sheiretov3 shared
Joseph Casassa3 shared
William F. Hutchings3 shared
Marlin D. Schutte3 shared

Nearby-Ranked Inventors

Takuma Inami18
Daniel Mills18
Jeffrey J. Beaver18
Atilhan Manay18
Chung-Wen Lo18
Andrew KENNEDY18
Max Heimel18
Kevin Skadron18
John B. Halander18