Sewer treatment to kill tree roots and other organic growth therewithin
Abstract
Abstract A COMPOSITION FOR KILLING PLANT ROOTS INSIDE SEWERS, COMPRISES AN ALKALI METAL ALKYL DITHIOCARBAMATE IN AN AMOUNT OF ABOUT 30%, A BIODERGRABLE LIQUID NONIONIC SUFACTANT IN AN AMOUNT OF ABOUT 12%, AND WATER MAKING UP THE REMAINDER. ONE METHOD FOR TREATING THE SEWER PIPES COMPRISE COATING THE INSIDE WALL OF THE PIPE AND ANY ROOTS OR OTHER GROWTH INSIDE THE PIPE WITH THE COMPOSITION IN THE FORM OF A FOAMY FILM BY SPRAYING IT THEREON OR ON THE UPER PORTION THEREOF, AS FROM A CONTINUOSLY MOVING DEVICE. PREFERRED APPARATUS FOR SO TREATING THE SEWER PIPES COMPRISS A SLED HAVING BOTTOM SKID MEANS, A LOW CENTER OF GRAVITY AND A SPRAY SYSTEM MOUNTED ON SAID SLED HAVING GENERALLY UPWARDLY DIRECTED NOZZELS, AND MEANS FOR PULLING THE SLED THROUGH A PIPE WHILE SUPPLYING IT WITH THE COMPOSTION UNDER PRESSURE. ANOTHER METHOD COMPRISE SOAKING WITH THE SOLUTION DILUTED TO ABOUT 2% OF THE METHYLDITHIOCARBAMATE, THIS BEING DONE BY PLUGGING THE PIPE AND FILLING THE PIPE ABOVE THE PLUG WITH THE DILUTED SOLUTION. SPECIAL PLUGGING APPARATUS IS DESCRIBED.
Inventors
- 👤 F Horne
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |