Polaroid Corporation

Edwin H Land

Stanley M Bloom

Gordon F Kinsman

Lloyd D Taylor

John B Morse

Conrad H Biber

Irena Y Bronstein-Bonte

Richard C Kee

Albert J Bachelder

Sarah H Perry

Howard G Rogers

Vivian K Walworth

Leonard Polizzotto

Philip G Baker

Neil C Mattucci

Leon D Cerankowski

Anthony J DiRocco

A stainable polymeric sheet material adapted to the production of a light polarizer therefrom is provided by a method, according to which, a support sheet of amorphous polymeric material is uniaxially stretched in a first direction (at or above the glass transition temperature of the polymeric support material), a layer of polyvinyl alcohol (PVA) is coated from an aqueous PVA-containing composition onto the uniaxially stretched support material, and the PVA-coated uniaxially stretched polymeric sheet material is stretched along a second direction, at an angle within about .+-.60 degrees to a normal to the first direction of stretch. The method provides a material which can be converted, by incorporation of visible dichroism into the PVA layer, to a light polarizer which combines efficient light polarizing properties and good mechanical strength and resistance to fracture along the stretch directions.

Method for preparing light polarizer

A relatively thin, flat or planar battery is disclosed which includes one or more cells in series relationship each comprising a planar anode in superposed relationship with a planar cathode and a separator disposed intermediate and extending substantially coextensive the facing surfaces of the anode and cathode possessing marginal portions and an aqueous electrolyte permeable central portion. Each cell includes an aqueous electrolyte disposed in the central portion of the separator and in contact with the facing surfaces of both the anode and the cathode and an electrically nonconducting, sealant extending intermediate and providing adhesive contact between the marginal portions of the separator and next adjacent facing surfaces. Each battery is designed to include a planar anode and/or cathode next adjacent a surface of the battery which electrode includes a conductive metal sheet; a gas permeable, water-vapor impermeable plastic sheet and an electrochemically active negative or positive material. At least one of the conductive metal sheets is designed to specifically include one or more orifices extending through the sheet to conduct from the battery gas generated within its cells.

Planar battery comprising a terminal plate having gas venting orifice

Copolymeric mordant materials containing recurring units according to the following formula are disclosed: ##STR1## In such copolymers, each of R.sup.1, R.sup.2 and R.sup.3 can independently be alkyl; substituted alkyl; cycloalkyl; aryl; aralkyl; alkaryl; or at least two of R.sup.1, R.sup.2 and R.sup.3, together with the quaternary nitrogen atom to which they are bonded, can complete a saturated or unsaturated, substituted or unsubstituted nitrogen-containing heterocyclic ring; and X is an anion. The molar ratio of a:b can range from about 0.1:1 to about 10:1, e.g., about 0.3:1 to about 3:1. The copolymeric mordant materials can be utilized as image-receiving layers and in photographic products and processes of the diffusion transfer type. The mordants are especially adapted to the production of dye images free of objectionable haze, yellowing or related image defects.

Copolymeric mordants

A photosensitive element comprising a support carrying photosensitive silver halide grains in a substantially predetermined spaced array and methods for forming such photosensitive elements.

Photosensitive element and method of preparing same

A fine-grain emulsion in a plurality of predetermined spaced depressions is coalesced to form, in situ, a plurality of single effective silver halide grains in a predetermined spaced array by the action of a solution of a silver halide solvent containing a dissolved silver salt.

Method for forming a photosensitive silver halide element

The sensitometric properties of multicolor diffusion transfer film units may be modified after the photosensitive element has been coated. Sensitometric modification is effected by a photoexposure through a layer of a color correction dye(s). In a preferred embodiment, the color correction dye(s) is bleachable and is contained in a layer over the image-receiving layer.

Multicolor diffusion transfer products

Copolymeric mordants and photographic products and processes utilizing

Diffusion transfer films and processes are disclosed wherein the processing composition includes a light-reflecting pigment and a pH-sensitive optical filter agent, and the image-receiving element carries a layer containing a substantially non-diffusible agent adapted to decolorize optical filter agent immediately adjacent the interface between said processing composition and said layer containing said decolorizing agent.

Color transfer film and process

An electronic flash adaptable for releasable connection to a camera of the type having an exposure control circuit automatically switchable from an ambient mode of operation to a flash mode of operation, includes an on/off power control switch adapted for automatically switching the camera control circuit to a flash mode of operation in correspondence with the powering up of the electronic flash. The electronic flash is powered by way of an extendable grip type switch which may be either stowed out of interfering relation with the position normally grasped by the camera user to accommodate use of the camera in an ambient mode of operation or extended into interfering relationship with the position normally grasped by the camera user to accommodate a flash exposure mode of operation.

Strobe switch with camera control feature

An audio system having an audio tape drive system and transducer intercoupled in a single unit of concentrated mass with tape contact confined to a short length of one side of the magnetic tape. A magnetic transducer head is mounted within a drive capstan so that both head and capstan contact essentially the same short length of the magnetic tape and a vacuum system is employed to draw the tape against both to thereby concentrate the mass and eliminate spaced tape engaging components so as to reduce tape flutter. Preferably, a capstan drive motor, a capstan, and a vacuum pump are mounted together and operate on an axis passing through the center of the capstan so as to concentrate the mass of the system at this point. The capstan includes peripheral openings designed to overlie one or both of the longitudinal film margins for delivering the vacuum which attracts the tape against both the capstan and the transducer which is located within a slotted portion of the capstan so as to ride on the central portion of the tape during advancement of the latter.

Sound motion picture system having concentrated audio system

Method and apparatus for avoiding undesirable wakes or blemishes in a coating of processing fluid deposited on a moving run of an exposed film strip. Such apparatus includes a doctoring surface which traverses the film strip at an oblique angle to the direction of film strip advancement for continuously urging and guiding particles carried by the film strip towards at least one of the longitudinal margins thereof and, hence, away from the useful intermediate portion of the film strip.

Method and apparatus for eliminating undesirable blemishes in coating of

A high voltage, low impedance laminar battery comprising a stack of series connected cells confined under pressure in a housing. The cells comprise laminar anodes, cathodes and separators. The cells are connected in series by laminar conductive intercell connectors. An annular spacer is associated with each cell. The spacers are separated by interdigitated ones of the separators and intercell connectors.

Compact high voltage battery

A system for spatially stabilizing the field of view of a photocell on a camera includes a ring mounted for pendulous movement about its central axis, parallel to the optical axis of the camera objective, a photocell lens mounted on the ring for limited pendulous movement about an axis perpendicular to the ring axis, and a photocell for receiving light passed by the lens from the scene being photographed. The pendulously mounted ring provides a roll sensitive control that maintains the field of view of the photocell, as determined by the photocell lens, in a fixed position in response to rotation of the camera about its optical axis while the pivotal lens mounting provides a pitch sensitive control that maintains the field of view of the photocell in a fixed spatial position in response to changes in the elevation angle of the camera. In one arrangement, a neutral density wedge, interposed between the lens and the photocell, is oriented so that its density gradient is aligned with the direction in which the ring is pendulously weighted such that the wedge modifies the light input transmitted to the photocell so as to make its output vary with respect to the camera elevation angle.

Camera having spatially stabilized photocell

A receiving element for use in a photographic silver diffusion transfer process which comprises a transparent support carrying a layer comprising gelatin, hydroxyethyl cellulose and noble metal silver-precipitating nuclei; wherein said nuclei are present in a level of from about 0.1-0.4 mgs/ft.sup.2, gelatin is present at a level of from about 0.05 to 1.5 mgs/ft.sup.2 and hydroxyethyl cellulose is present at a level of about 0.1 to 7 mgs/ft.sup.2. Preferably, the noble metal is palladium. The receiving element is particularly useful in an additive color diffusion transfer process.

Silver diffusion transfer receiving layer comprising HEC and gelatin

A receiving element for use in a photographic silver diffusion transfer process which comprises a transparent support carrying a layer comprising gelatin, polyvinyl alcohol and noble metal silver-precipitating nuclei; wherein said nuclei are present in a level of from about 0.1-0.4 mgs/ft.sup.2, gelatin is present at a level of from about 0.05 to 1.5 mgs/ft.sup.2 and polyvinyl alcohol is present at a level of about 0.1 to 5 mgs/ft.sup.2. Preferably, the noble metal is palladium. The receiving element is particularly useful in an additive color diffusion transfer process.

Growing community of inventors

Cambridge, MA, United States of America

Edwin H Land