Abstract: An improved photographic film packet (P) has a photosensitive film sheet (F) , an elongate carrier sheet (C), a light shielding envelope and a transversely disposed element (30) secured to the carrier (C). The light shielding envelope (E) has a closed leading end portion and a closable trailing end portion (46). The trailing end portion includes lateral edge portions 46a, 46b) The transversely disposed element (30) or clip, being substantially U-shaped, has a vertex (30v) with an interior wall (33) that enables at least the lateral edge portions (46a, 46b) of the trailing end portion (46) of the envelope E to abut thereagainst for closing the trailing end portion (46). In another embodiment of the invention, transversely disposed element (30) is also provided with inward-facing dimples (31d) on at least one segment of first and second flange portions (30a,30b) that project from the vertex (30v).

Abstract: A hand-held power injection device is provided for injecting liquid, such as contrast media, into the vascular system of a mammal. The device comprises a pistol-shaped housing which encloses a battery-powdered D. C. motor for constant-rate delivery of liquid from a syringe.

Abstract: An optical disk assembly includes a web assembly having a flexible disk-shaped support web carrying a record layer. The support web has an information storage region. A pair of annular retaining ring members engage opposite sides of an annular peripheral region of the web assembly to clamp the support therebetween. The peripheral region of the support is wrapped about an annular reference surface of one ring member and is pushed into an annular recess with undercut area in that ring member. The other ring member is formed from a malleable ring, such as an annular tube, which is deformed into the recess undercut to provide a locking interfit therebetween. The peripheral region of the web assembly is interleaved between the ring members.

Abstract: This disclosure relates to an optical disk unit with two states in which the web assembly is in different circumferentially-symmetric tensions. One tension is sufficiently great to provide the desired degree of planarity when used with write/read apparatus. The other tension is significantly reduced, keeping the web assembly materials well below their elastic limits to reduce tension and prolong product life. The optical disk unit includes a flexible disk-shaped web assembly including a support web and preferably an opposed cover sheet. An annular retaining ring engages the web assembly around its periphery. The support web carries a record layer with an information storage region. The annular retaining ring includes selectively operable means for changing the state of the disk unit to adjust the web assembly tension between the two tensions. In one embodiment, the state-changing means includes a bi-stable spring having a stable condition for each of the two web assembly tensions.

Abstract: A plural circuit filter for electromagnetic waves, especially microwaves, of the type which comprises dielectric resonators, is provided wherein dielectric resonator disks or washers are positioned in a tubular metallic housing acting as a shield, the resonator disks being positioned centrally of the housing tube with the axes of the disks extending perpendicularly to the axis of the tube and the separate resonator disks being separated in the housing by apertured partitions which partly determine the coupling coefficient between adjacent circuits.

Abstract: a battery package includes a plurality of cylindrical cells electrically connected in series and wrapped in a plastic web. The web includes a plurality of adjacent, parallel arches or arcuate sections that conform generally to the cylindrical shape of the cells to constrain the cells in the package in a predetermined relationship. Although the web is somewhat flexible, it provides a generally rigid package when secured around the cells. In one embodiment, a single web engages the cells against a more solid structural piece to define a stable battery structure. In another embodiment the cells are encased in opposed plastic webs, each having a plurality of arches separated by intermediate sections. The opposed webs are then sealed together at the intermediate sections to capture the cells between the arches and to rigidify the overall battery structure. In still another embodiment, two cells, welded together end-to-end, are inserted into a tube of plastic shrink wrap.