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Re: Philips Penthode patent text uit 1927

Geschreven door John Hupse op 13. Dec 2003 19:28:15:

In reactie op: Philips Penthode patent text uit 1927 geschreven door Dr.Tube op 12. Dec 2003 09:34:36:

In de buizen bijbel van John W. Stokes staat hierover:

"By an odd quirk of fate the patent application lapsed before the necessary formalities were completed and no Dutch patent was ever issued. Legally anyone was free to manufacture penthodes in Holland! Such was certainly not the case elsewhere for Philips quickly took steps to safeguard their new invention by taking out patents in no less then 18 other countries"





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