E.i. Dupont De Nemours and Company

Other

Invista North America S.a.r.l.

Invista Technologies S.a.r.l.

Robert L Lock

Thomas Dziomba

Hong Liu

Bryan Benedict Sauer

Kenneth Edward Martin

Ronald D Bing-Wo

Iftekhar A Karimi

Anti-tack additives for elastic fibers and methods of preparing the same are included. The elastic fibers include a substituted cellulose additive.

Elastic fiber containing an anti-tack additive

A method for unwinding tacky elastomeric yarn from one or multiple coiled yarn packages includes the steps of (a) removing tubular cores from each yarn package to expose the beginning end of the yarn strand at the inner diameter of the yarn package; (b) forming a terminal end of the yarn strand at a position along the length of the strand between the inner diameter and outer diameter of the yarn package; (c) when unwinding multiple coiled yarn packages, attaching the terminal end of the first yarn package to a beginning end of a next yarn package; and (d) unwinding by pulling the beginning end of the first yarn package in a generally axial direction to remove yarn from the inside of the package from the inner diameter toward the outer diameter. This method provides inside-out unwinding of a single package, or continuous unwinding of multiple packages of elastomeric yarn at a reduced overall yarn tension, and minimizes unwinding tension spikes.

Method for unwinding elastomeric yarn from coiled packages

Spandex containing certain anti-tack additives and having good dry-spinning continuity, and the process for making such spandex are provided.

Spandex with low tackiness and process for making same

A refurbishing device (10) for a fish tape (12) comprising a base (14) and three studs (16). An assembly (18) is for attaching the studs (16) in equally spaced apart locations through the base (14), so that the studs (16) will extend from a bottom side (20) of the base (14). A handle (22) is also provided. An assemblage (24) is for securing the handle (22) to a top side (20) of the base (14) opposite from the studs (16). A person (28) can grasp the handle (22) with a first hand (30) and pull the coiled fish tape (12) between the studs (16) approximately three times with a second hand (32), thus reconditioning the fish tape (12) to like a new, straight and usable condition.

Refurbishing device for a fish tape

A third rail warning device in which the third rail carries in use a dangerously high voltage. Connected to the third rail is a source of relatively safe voltage as a warning that the dangerously high voltage is about to be applied to the third rail. A time delay is employed to terminate the safe voltage and permit automatic connection of the dangerously high voltage, and an alarm is actuated when the safe voltage is being applied to the third rail.

Non-hazardous third rail energizing warning device

The present invention relates to a process for spinning silk fibers. The process involves dissolving silk fibroin in an aqueous salt solution, removing the salt from the solution, followed by removal of the water to form a regenerated silk material. The silk material is then dissolved in hexafluoroisopropanol to form a fiber-spinnable solution.

Process for making silk fibroin fibers

Polypeptide fibers, fiber spinnable solutions, and a process for forming polypeptide fibers are disclosed. The invention includes forming polypeptide fibers from spinning solutions containing a polypeptide, and a solvent selected from the group consisting of hexafluoroisopropanol, and a mixture of formic acid and at least one lithium halide.

Growing community of inventors

Waynesboro, VA, United States of America

Robert L Lock