Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 71,821   Posts: 1,581,834   Online: 1152
      
Results 1 to 7 of 7
  1. #1

    Join Date
    Jan 2007
    Location
    Australia
    Shooter
    Med. Format RF
    Posts
    127

    Patents for emulsions, coating machines etc

    The excellent new Google site allows very easy searching and PDF saving of patents. Here are some interesting ones that I found at a quick glance.

    http://www.google.com/patents

    2384657 Coating film
    2411507 Ilford emulsion
    1539697 Coating Film Year = 1923
    370050 APPARATUS FOR COATING PHOTOGRAPHIC PAPER Year = 1887

  2. #2
    AgX
    AgX is offline

    Join Date
    Apr 2007
    Location
    Germany
    Shooter
    Multi Format
    Posts
    9,035
    I gave that site a try some time ago, it did no work at all.
    Now it seems to be a real alternative to those other patent sites.

  3. #3

    Join Date
    Jan 2007
    Location
    Australia
    Shooter
    Med. Format RF
    Posts
    127
    Yes, it seems superior to the US Government site as it allows searching patents pre 1970....and it allows direct saving as a PDF.

    Quote Originally Posted by AgX View Post
    I gave that site a try some time ago, it did no work at all.
    Now it seems to be a real alternative to those other patent sites.

  4. #4
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    23,526
    Images
    65
    The one patent listed, 2384657, is for an early trough coater with festoon drying. It was obsolete virtually at the time the patent issued.

    A method similar to this is used at many of the older plants in Europe. The festoon rods can create defects and may therefore limit the maximum length of good coating to the floor to ceiling height in the plant.

    It was a good way to get coating defects unless the entire drying area was essentially a HEPA drying cabinet with controlled humidity and temperature.

    PE

  5. #5

    Join Date
    Jan 2007
    Location
    Australia
    Shooter
    Med. Format RF
    Posts
    127
    Thanks PE. Would some of the former East European film makers still use the trough process?

    Here are some more modern coating patents.

    2761791 Cascade coating process
    3508947 Curtain coating

  6. #6
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    23,526
    Images
    65
    I believe that some do use a modified trough coater. I think that they use a doctor blade for uniformity though which is in another patent.

    PE

  7. #7
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    23,526
    Images
    65
    I checked out the two patents. Yes, I am very familiar with both of these systems. I didn't know Ted, but have met Don, the inventor of curtain coating at EK.

    I typically coated 4 or 6 slide or 6 or greater curtain coatings. The hoppers used looked almost identical to those in the diagrams. One of the diagrams is a close analog of the original extrusion coater which coated one layer at a time. It was modified by an insert to allow two or more layers.

    We had large felt padded boxes of varying sizes that contained cradles for the various hoppers. We put the request in with the type of hopper and width. We could choose between 4.5" up to about 12" in research and from 21" - 72" in the plant.

    PE



 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin