Inventor
Leonard J. Persinski
Inventor
Pittsburgh, PA, US
Overview
Patents· 15 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
C09Kprimary
C09KMaterials for miscellaneous applications, not provided for elsewhere33%
C07FAcyclic, carbocyclic or heterocyclic compounds containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen, sulfur, selenium or tellurium17%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests17%
C04BLime, magnesia14%
C02FTreatment of water, waste water, sewage, or sludge8%
C23FNon-mechanical removal of metallic material from surface6%
F02BInternal-combustion piston engines6%
PatentTitleYear
6,054,417'Rapid gel formation in hydrocarbon recovery'20006,004,908'Rapid gel formation in hydrocarbon recovery'19995,693,837'Ferric alkyl amine citrates and methods of making them'19975,647,900'Preparation of hydrocarbon gels from ferric sources, polycarboxylic acid compounds, and optional amines, in combination with phosphate esters'19975,614,010'Hydrocarbon gels useful in formation fracturing'19975,571,315'Hydrocarbon gels useful in formation fracturing'19965,417,287'Hydrocarbon gels useful in formation fracturing'19955,087,376'Multifunctional scale inhibitors'19924,936,987'Synergistic scale and corrosion inhibiting admixtures containing carboxylic acid/sulfonic acid polymers'19904,640,793'Synergistic scale and corrosion inhibiting admixtures containing carboxylic acid/sulfonic acid polymers'19874,040,854'Methods of using cementing compositions having improved flow properties, containing phosphonobutane tricarboxylic acid'19774,036,660'Methods of using cementing compositions having improved flow properties, containing sulfonated copolymers of styrene-maleic anhydride'19774,015,991'Low fluid loss cementing compositions containing hydrolyzed acrylamide/2-acrylamido-2-methylpropane sulfonic acid derivative copolymers and their use'19773,964,921'Well cementing composition having improved flow properties, containing phosphonobutane tricarboxylic acid, and method of use'19763,952,805'Well cementing method using a composition having improved flow properties, containing sulfonated copolymers of styrene-maleic anhydride'1976Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1976–1992Patents assigned to CALGON CORP (8)· patent assignee history
1976–2000Based in Pittsburgh, PA, US· patent location history
1995–2000Patents assigned to CLEARWATER INC (7)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| CALGON CORP | 8 | 1976–1992 |
| CLEARWATER INC | 7 | 1995–2000 |
Locations
| Location | Patents | Span |
|---|---|---|
| Pittsburgh, Pennsylvania, US | 15 | 1976–2000 |