Abstract: A motion limiter (2) for use with a short leg walker (4) includes a threaded shaft (20) passing freely through a hole (42) in a sliding block or guide (36) that is pivotally attached preferably to an upper part (6) of the walker. The lower end (28) of the shaft is preferably pivotally mounted in a recess (34) in the lower portion (10) of the walker and the remainder of the shaft is free to slide within the hole in the sliding block within a recess (26) in the upper part of the walker. The position of stop members (64, 68), threaded to the shaft above and below the block, determine the amount or fraction of the shaft permitted to pass through the hole in the sliding block. As the stop members are positioned along the shaft relatively far apart from one another, a greater length of the threaded shaft is permitted to pass through the sliding block, thereby increasing the range of motion of the walker. Conversely, as the stop members are moved relatively closer together, the range of motion decreases.

Abstract: Disclosed are copolyesters comprising an acid component of 4,4'-biphenyldicarboxylic acid and a glycol component comprising 1,6-hexanediol and 1,4-butanediol. The copolyesters exhibit unusually high tensile strengths.

Abstract: Disclosed are copolyesters comprising an acid component of 4,4'-biphenyldicarboxylic acid and a glycol component comprising 1,4-cyclohexanedimethanol and ethylene glycol. The copolyesters exhibit unusually high tensile strength.

Abstract: Disclosed are compositions of matter characterized by having a tensile strength of at least 13,000 psi and moldable at temperatures below 285.degree. C. comprising a blend of(a) about 10-95 weight % of a polyester containing repeating units from trans-4,4'-stilbenedicarboxylic acid 1,6-hexanediol, and(b) about 90-5 weight % of a polycarbonate of 4,4'-isopropylidenediphenol.

Abstract: Disclosed are compositions of matter characterized by having improved tensile strength comprising a blend of(a) about 30-95 weight % of a polyester containing repeating units from biphenyldicarboxylic acid 1,6-hexanediol, and(b) about 70-5 weight % of a polycarbonate of 4,4'-isopropylidenediphenol.

Abstract: Disclosed are phenyl esters of stilbenedicarboxylic acid. The carboxylate portions of the compounds are bonded at the meta or para positions of the stilbene moiety.

Abstract: Disclosed are polyesters containing repeating units from trans-4,4'-stilbenedicarboxylic acid and 1,6-hexanediol, the polyesters having an I.V. of at least 1.20, a tensile strength of at least 20,000 psi in 1/16-in. thick injection-molded bars, and a melt viscosity of 3000 poise or less at 265.degree. C. and a shear rate of about 107 sec.sup.-1.

Abstract: Disclosed is a process for producing dimethyl or novel diphenyl derivatives of stilbenedicarboxylic acids from dimethyl toluates or diphenyl toluates and sulfur. The reaction requires an excess of toluate to sulfur of at least about 5:1. In addition hydrogen sulfide is removed from the reaction zone.

Abstract: Polymer compositions containing repeating units from 0 to 95 mol percent of aromatic dicarboxylic acids containing 8 to 16 carbon atoms and having at least three carbon atoms between carboxyl groups or esters thereof, repeating units from 0 to 95 mole % 1,4-cyclohexanedimethanol, repeating units from 5 to 100 mol % trimellitic acid or anhydride, and repeating units from 5 to 100 mol % 4-(aminomethyl)cyclohexanemethanol, and wherein the mol % of the repeating units from the trimellitic acid or anhydride does not exceed the mol % of repeating units from the 4-(aminomethyl)cyclohexanemethanol.

Abstract: The polyesters of trans-4,4'-stilbenedicarboxylic acid, 5-95 mol % 1,4-butanediol, and 95-5 mol % 1,6-hexanediol can be injection-molded to give shaped objects having exceptionally high tensile strength and stiffness. Many of the copolyesters of this invention have excellent chemical resistance and good hydrolytic stability. The copolyesters can be injection-molded, spun into fiber, or extruded into film having these properties.

Abstract: The polyesters of trans-4,4'-stilbenedicarboxylic acid, 95 to 50 mol % 1,4-butanediol, and 5 to 50 mol % 1,4-cyclohexanedimethanol can be injection-molded to give shaped objects having exceptionally high tensile strength and heat resistance. Many of the polyesters also have excellent hydrolytic stability and chemical resistance. The polyesters of this invention can be molded, extruded into film, or spun into fibers having these properties.

Abstract: The polyesters of trans-4,4'-stilbenedicarboxylic acid, 95 to 60 mol % 1,4-butanediol, and 5 to 40 mol % ethylene glycol can be injection-molded to give shaped objects having exceptionally high heat resistance. Many of the polyesters also have excellent hydrolytic stability and chemical resistance. The polyesters of this invention can be molded, extruded into film, or spun into fibers having these properties.

Abstract: The polyesters of 100 mol % trans-4,4'-stilbenedicarboxylic acid, 55 to 5 mol % 1,4-cyclohexanedimethanol, and 45 to 95 mol % 1,6-hexanediol can be injection-molded to give shaped objects having exceptionally high tensile strength and heat resistance. Many of the polyesters also have excellent hydrolytic stability and chemical resistance. The polyesters of this invention can be molded, extruded into film, or spun into fibers having these properties.

Abstract: The polyesters of trans-4,4'-stilbenedicarboxylic acid, 95-60 mol % 1,6-hexanediol, and 5-40 mol % ethylene glycol can be injection-molded to give shaped objects having exceptionally high tensile strength and stiffness. Many of the copolyesters of this invention have excellent chemical resistance and good hydrolytic stability. The copolyesters can be injection-molded, spun into fiber, or extruded into film having these properties.

Abstract: Polymer compositions containing repeating units from 0 to 95 mol percent of aromatic dicarboxylic acids containing 8 to 16 carbon atoms and having at least three carbon atoms between carboxyl groups or esters thereof, repeating units from 0 to 95 mol % 1,4-cyclohexanedimethanol, repeating units from 5 to 100 mol % trimellitic acid or anhydride, and repeating units from 5 to 100 mol % 4-(aminomethyl)cyclohexanemethanol, and wherein the mol % of the repeating units from the trimellitic acid or anhydride does not exceed the mol % of repeating units from the 4-(aminomethyl)cyclohexanemethanol.

Abstract: Blends of bisphenol A polycarbonate with poly(ester-imides) and poly(ester-imide-amides). The poly(ester-imides) and poly(ester-imide-amides) contain repeating units from 0 to 95 mol percent of aromatic dicarboxylic acids containing 8 to 16 carbon atoms and having at least three carbon atoms between carboxyl groups or esters thereof, repeating units from 0 to 95 mol % 1,4-cyclohexanedimethanol, repeating units from 5 to 100 mol % trimellitic acid or anhydride, and repeating units from 5 to 100 mol % 4-(aminomethyl)cyclohexanemethanol, and wherein the mol % of the repeating units from the trimellitic acid or anhydride does not exceed the mol % of repeating units from the 4-(aminomethyl)cyclohexanemethanol.

Abstract: A pneumatic controller for use in controlling airflow in a conditioned air distribution system is adjustable to accommodate different types of damper actuation and thermostats in different systems. The four-function controller can be manually reconfigured to be a direct acting/direct reset controller, a reverse acting/reverse reset controller, a direct action/reverse reset controller or a reverse acting/directing resent controller, all using a single diaphragm valve responsive to differential pressure between total air and static air inputs. A reset unit on one end of the controller can be mounted in four different positions, two upright and two inverted, to provide the four functions, with total air and static air inputs being reversed in position when the controller is in a reverse acting mode. A differential pressure responsive valve at the heart of the system is controlled by a spring which can act as either a tension spring, for direct acting, or as a compression spring, for reverse acting.

Abstract: Disclosed are blends of polyesters of terephthalic acid, trans-4,4'-stilbenedicarboxylic acid, and bisphenol A polycarbonate. The polymers are compatible, and blends prepared from these polymers have excellent impact strength and are useful as molding plastics, fibers, and films.

Abstract: The polyesters of 95 to 40 mol % terephthalic acid, 5 to 60 mol % trans-4,4'-stilbenedicarboxylic acid, and at least 60 mol % 1,4-cyclohexanedimethanol can be injection molded to give shaped objects having exceptionally high impact strength and good chemical resistance. In addition, the polyesters of this invention can be extruded into films, spun into fibers, or blown into bottles having these properties.

Abstract: Copolyesters of poly(ethylene terephthalate) modified with greater than 10 to about 40 mol % trans-4,4'-stil-benedicarboxylic acid can be melt spun to give as-spun fibers with exceptionally low shrinkage at elevated temperatures and with tensile strengths and moduli equivalent to those of fully oriented poly(ethylene terephthalate). They may be drafted to give fibers with tenacities >8 g/den and moduli >150 g/den. In addition to the unobviously high tenacities and moduli of as-spun fibers, oriented shaped articles, such as films and bottles, of copolyesters of this invention have lower gas permeabilities than poly(ethylene terephthalate). For example, the oxygen permeability of these copolyesters is 25 to 50% lower than that of poly(ethylene terephthalate).