Pontoon structures, particularly a low-cost watercraft defining a plurality of isolated compartments vented at their tops with respect to each other and each compartment having an independent valve in its bottom. The isolation of the compartments assures stability or seaworthiness, while the venting of the compartments at their tops assures the use of compressed air for uniform control of water level in the compartments. The independent valve in the bottom of each compartment enables precise reg...

A self-loading takeup reel for use in a tape transport which is provided with a supply tape having a relatively stiff leader wider than the tape attached to one end. The reel has a flexible flange attached to one side of the hub which resiliently biases the leader against a preferably rigid flange when the leader is received between the flanges.

A cable reel trailer including a wheeled, Y-shaped main frame is pivotably attached to a tongue having a coupling for attachment to a towing vehicle. Reel supporting and lifting surfaces, secured to uprights mounted upon the main frame, transfer the reel between the trailer and the ground upon pivotable displacement of the tongue relative to the main frame due to movement of the towing vehicle and tongue relative to the main frame support wheels.

A needle having an elongated body tapered to a point at one end thereof and having two spaced apart legs at the other end thereof, a thread holder pivotally mounted on the body between the spaced apart legs and having an elongated slot therein extending to one side thereof and ending at opposed grooves in the thread holder extending from the slot to the end of the thread holder away from the pivotal connection. The thread holder is movable between a thread receiving position wherein the slotted ...

A getter device comprising a carrier having on at least one of its faces particles of a nonvaporative getter metal characterized in that the particles of the getter metal are partially embedded in the carrier to give a highly efficient getter device.

Five and six membered ring perfluorinated cyclic acid and acid fluorides are reacted with organic acids, salts of organic acids, alkanol sulfate salts, aqueous basic solutions or molecular sieves to obtain five and six membered ring fluoroalkyl substituted and unsubstituted perfluoroolefins having six to 10 carbon atoms. 5 Claims, No Drawings

A high conductivity metallurgy interconnection system for semiconductor devices is formed of laminar stripes having a film of gold disposed between films of tantalum-nitrogen.

A dual-element typewriter mounts the print elements a fixed distance apart with a carrier support system and operates each element from a single keyboard and selection system. A control is positionable to select the desired element. Each element is connected to opposite ends of a flexible strand and pulley system for rotating and tilting the elements to position the selected character at the print point. The control operates to prevent the rotation and tilting of one element so that the strand a...

This invention relates to a process for preparing ethylene glycol esters by intimately contacting a mixture of ethylene, bromine or chlorine (or a bromine or chlorine containing compound) and oxygen, in the presence of a carboxylic acid and a variable valent metal cation. It also relates to a process for preparing vinyl acetate from ethylene, by pyrolysis of ethylene glycol diacetate prepared as above noted, and to the preparation of ethylene glycol monoester as well as ethylene glycol by the hy...

A security door locking system including interiorly and exteriorly key operable locks for disabling the interior and exterior door handles. The interior latch lock buttons are operable to lock the car doors, but are inoperable to unlock the doors. Once the doors are locked, unauthorized access cannot be gained to the automobile by manipulating either the exterior or interior door handles.