Date: Patented August 31, 1954 



Assignee: United States of America 



Use: Measurennent of intensity and di- 



rection of voltage gradients in 

 fluid media, particularly natural 

 waters; facilitates 3-dimensional 

 plotting of electrostatic field pat- 

 terns and field intensities. 

 Inventors: William L. Stahl and Vernon C. 

 Applegate 



Disclosure: METHOD AND APPARATUS FOR 

 CONTROLLING AQUATIC 

 ANIMALS 

 Number: 2,778,140 



Date: Patented January 12, 1957 



Assignee: United States of America 



Use: Selective control of migratory 



fish aind fishlike vertebrates in 

 streams through the use of AC 

 and DC fields of predetermined 

 intensity. 

 Inventors: Vernon C. Applegate, William L. 

 Stahl, and Bernard R. Smith 



Disclosure: METHOD FOR CONTROLLING 

 PETROMYZON MARENUS 



Number: Application Serial Number 



574,931 



Date: March 29, 1956 



Use: Control of sea lamprey popula- 



tions by the chemical treatment 

 of streams with 3-bromo-4-ni- 

 trophenol, a selectively toxic 

 agent. Controlled applications 

 permit destruction of all larval 

 lampreys in a watershed without 

 causing significant harm toother 

 aquatic life. 



Vernon C. Applegate and John H. 

 Howell 



METHOD FOR CONTROLLING 

 SEA LAMPREYS (PETRO- 

 MYZON MARINUS) 

 2,821,499 



Patented January 28, 1958 

 United States of America 

 Control of lamprey populations by 

 the chemical treatment of 

 streams with O -ethyl-S-penta- 

 chlorophenyl thiolcarbonate, a 

 selectively toxic agent. Con- 

 trolled applications permit 

 destruction of all larval lampreys 

 ^ in a watershed without causing 



significant harm to other aquatic 

 life. 

 Inventors: Vernon C. Applegate and John H. 

 Howell 



Disclosure: APPARATUS FOR CONTROL- 

 LING THE UPSTREAM MOVE- 

 MENT OF FISH 



Number: 2,913,846 



Date: 



Assignee: 



Use: 



Inventors: 



Disclosure: 



Number: 

 Date: 

 Assignee: 

 Use: 



Inventor: 



Disclosure: 



Numbe r: 



Date: 

 Use: 



Inventors: 



Disclosure: 

 Number: 



Date: 



Use: 



Inventors: 



Disclosure: 



Number: 



Date: 

 Use: 



Inventors: 



Disclosure: 



Number: 



Date: 

 Use: 



Patented November 24, 1959 

 United States of America 

 Guidance or diversion of fish 

 migrating in a body of water 

 toward a specific locale such as 

 a fish trap, fish ladder, or di- 

 version channel using an electric 

 field of interrupted direct current 

 of predetermined intensity. 

 Aulberton L. McLain 



METHOD OF CONTROLLING 

 SEA LAMPREYS WITH 

 HALOGEN NITROPHENOLS 

 Application Serial Number 



652,316 

 April 11, 1957 



Control of lamprey populations by 

 the chemical treatment of 

 streams with various halogen 

 mononitrophenols. Controlled ap- 

 plications provide results indi- 

 cated for Patent No. 2,821,499. 

 Vernon C. Applegate and John H. 

 Howell 



METHOD FOR CONTROLLING 



PETROMYZON MARINUS 

 Application Serial Number 

 726,021 



April 2, 1958; abamdoned 

 Control of lamprey populations by 

 the chemical treatment of 

 streams with 3-trifluormethyl- 

 4-nitrophenoI. Controlled appli- 

 cations provide results indicated 

 for Patent No. 2,821,499. 

 Vernon C. Applegate amd John H. 

 Howell 



METHOD FOR CONTROLLING 



PETROMYZON MARINUS 

 Application Serial Number 

 736,408 

 May 19, 1958 



Control of lannprey populations by 

 the chemical treatment of 

 streams with 2-chloro-4-nitro- 

 phenol. Controlled applications 

 provide results indicated for 

 Patent No. 2,821,499. 

 Vernon C. Applegate and John H. 

 Howell 



METHOD OF CONTROLLING 



SEA LAMPREY 

 Application Serial Number 

 336,079 



January 6, 1964 



Control of sea lamprey popula- 

 tions by the use of chemicals 

 selectively toxic to sea lamprey 

 larvae. These chemicals consist 

 of mixtures containing from 1 to 



51 



