Patents by Inventor Philip van Roij

Philip van Roij has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Water soluble fertilizer compositions
    Patent number: 6312493
    Abstract: The present invention relates to a solid water soluble fertilizer composition containing one or more fertilizer materials and a phosphate free, organic acid which is solid at ambient temperatures. The fertilizer materials include primary macro nutrients, secondary macro nutrients, micro nutrients and mixtures thereof. The organic acid has a water solubility of at least 10 g/l (at 25° C.) and an acidifying effect in the range of 0.5 to 1.3 g HCO3−/g acid. The acidifying effect is defined as the amount of HCO3− that can be transformed into H2CO3 per gram of acid and is calculated in accordance with the following formula: 61 ⁢ n M w , acid wherein Mw,acid is the molecular weight of said acid and n represents the number of dissociation constants (i.e., pKa values) of the acid below the value of 6.35.
    Type: Grant
    Filed: October 7, 1999
    Date of Patent: November 6, 2001
    Assignee: OMS Investments, Inc.
    Inventors: Michael Gustaaf Eltink, Philip van Roij, Edze Jan Tijsma, Johannes Gijsbertus Antonius Terlingen, Hendrikus Gijsbertus Adrianus van Kaathoven