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Preventing damage to film due to abnormal operation of projector

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  • CPC
  • G03B21/42
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GPHYSICS G03Photography G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES ACCESSORIES THEREFOR G03B21/00Projectors or projection-type viewers Accessories therefor

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G03B21/42Preventing damage to film due to abnormal operation of projector
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Patents Grantslast 30 patents

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    • Patent number 4,078,765
    • Issue date Mar 14, 1978
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    3447867
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    3398914
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    3331653
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    3268286
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    3160227
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    2616690
    • Patent number 2,616,690
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    2252285
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    1984847
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Patents Applicationslast 30 patents