Photographic film packet and light locking element

An improved film packet comprising:

• a film strip comprising a image portion and a leader portion;
• a light shielding envelope removably enclosing at least said image portion of said film strip, said envelope having first and second opposing walls, and a closed leading end portion and a closable trailing end portion, said trailing end portions having a lateral edge portion, said trailing end portion being closable by cooperative engagement of said lateral edge portions with a transversely disposed substantially U-shaped element;
• wherein said transversely disposed substantially U-shaped element comprises a vertex defining a closed end section having an interior wall, and generally diverging first and second flange portions projecting from said vertex defining an open end section, said first and second flange portions each having a plurality of angular portions, at least one of said angular portions on each said first and second flange portions comprising a plurality of opposed inward-facing dimples for compressively engaging said first and second opposing walls of said envelope thereby preventing the ingress of light therein, and wherein at least the lateral edge portion of said trailing end portion of said envelope, when fully disposed in the open end portion of said element, abuts against said interior wall of said closed end section thereby providing a light-lock closure of the trailing end portion.

An improved photographic film packet comprising:

• a photosensitive film sheet having a leading and trailing end portions;
• an elongate carrier sheet having first and second outward-facing surfaces, said carrier sheet including leading and trailing end sections and an intermediate section between said end sections, said film sheet being detachably attached to said first outward-facing surface of said intermediate section with said leading and trailing end portions thereof oriented toward said leading and trailing end sections respectively, said leading end section extending longitudinally beyond said intermediate section, said trailing end section extending longitudinally beyond said intermediate section having a substantially U-shaped transversely disposed element secured thereto;
• a light shielding envelope removably enclosing said carrier sheet and said film sheet, said envelope having first and second inward-facing surfaces overlying said first and second outward-facing surfaces respectively, said envelope including longitudinally extending leading and trailing end portions overlying said leading and trailing end sections respectively, said trailing end portion having a lateral edge portion, said leading end portion being sealed closed, said trailing end portion being closable by cooperative engagement of said lateral edge portion with said transversely disposed element;
• and,
• wherein said substantially U-shaped transversely disposed element comprises a vertex defining a closed end section having an interior wall, and wherein at least the lateral edge portion of said trailing end portion of said envelope, when fully disposed in the open end portion of said element, abuts against said interior wall of said closed end section thereby providing a light-lock closure of the trailing end portion.