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  1. #11
    Photo Engineer's Avatar
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    Quote Originally Posted by Mustafa Umut Sarac View Post
    Photo Engineer , Are patents from Kodak ? There are 7000000 patents at uspto and hundreds may be thousand of them using kodachrome term.
    I think I am interested in 3 color developers. Can you write more and give us specific patent class least for this process. Or you can copy and paste from united states patent office lists as a reference ? There are zillions of chemicals and your eye can select them.
    I want to do this at home and i need your guide.
    The entire process is given in a patent to Bent and Mowrey of Eastman Kodak. In this, the CD-6 developer is disclosed.

    You will note that the patent has been abandoned (thereby donating it to the public).

    PE

  2. #12
    AgX
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    Mustafa,

    before you are going to follow the paths of Mannes and Godowsky, don't forget that you have a lot of image diffusion transfers to do...
    I just did that post on Polaroid.

  3. #13
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    Leadly and Stegmeyer disclose a method of making tricolor separations that can be combined into Kodachrome type transparencies.

    PE

  4. #14

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    US Patent 3,658,525.

  5. #15
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    Quote Originally Posted by Photo Engineer View Post
    You will note that the patent has been abandoned (thereby donating it to the public).

    PE
    They abandoned this in 1975, a mere 3 years after its granting. So what didn't work in it? :-)

  6. #16
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    It is fully implemented in the current Kodachrome process. I have no information on why it was abandoned. The patent was on the yellow layer color developing agent, CD-6. There were several patents on this developing agent.

    PE

  7. #17
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    Quote Originally Posted by Neanderman View Post
    They abandoned this in 1975, a mere 3 years after its granting.
    There could be many reasons for abandoning a patent. In Kodak's case, it could be that they perceved a lack of competition, thus no need to keep the patent valid. Since they have the patent issued, no one else could patent it, so Kodak is free to use it as they see fit. All that changed is that they are no longer claiming a mononply on it.

    Perhaps they didn't feel it was worth paying the maintenaince fees?

  8. #18

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    Maybe to avoid anti-trust difficulties?

  9. #19
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    Craig;

    The maintenance fees on all of the EK patents is a yearly killer in the budget, and so if there is no competition they will not maintain the patent. Since they decided not to use CD-6 in Ektachrome E6 nor in RA chemistry, it was therefore used only in Kodachrome. And, that is about the year that Fuji begain withdrawing from Kodachrome.

    PE

  10. #20
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    Quote Originally Posted by Photo Engineer View Post
    Craig;

    The maintenance fees on all of the EK patents is a yearly killer in the budget, and so if there is no competition they will not maintain the patent.
    That makes perfect sense, and is likely the reason for the patent being abandoned, as the first maintenaince fee is due at 3.5 years from issuance. The fees increase as the patent ages, so it would be logical for EK to review each patent for usefulness before paying the fees.

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