Abstract: A differential pressure switch particularly suitable for monitoring dirt accumulation on a filter element of an oil-separating air filter comprising a piston which is movable in response to a relative change in pressure between two pressure zones and is biased in one direction by a restoring spring, and a rolling membrane which separates the pressure zones.

Abstract: Diterpenes of the formula I ##STR1## in which R.sup.1 is --CH.sub.2 --C(CH.sub.3).dbd.CH--R.sup.3 or --CH.sub.2 --CH(CH.sub.3)--CH.sub.2 --R.sup.3,R.sup.3 is --CH.sub.2 OH, --CHO, --COOH or --COOR.sup.4,R.sup.4 is alkyl having 1 to 5 C atoms,A is ##STR2## and R.sup.2 is H, pentoses, hexoses, di-/oligosaccharides or amino sugars,are suitable for production of medicaments having immunomodulatory action, in particular stimulating T-cells.

Abstract: The present invention is an air filter assembly which includes a frame having a filter mounted therein. The filter is constructed of woven microfilament strands having a cross-sectional height of at most 30 microns, the strands being spaced apart by at most 20 microns. The filter medium is single-ply so as to be non-entraining. Each strand preferably has a smooth outer surface for repelling particles smaller than the size of the openings in the filter. The frame may laterally adjustable, if desired. In an alternative embodiment, the filter includes a single-ply sheet of a filtering material having openings cut therein. The filtering material preferably has a smooth outer surface facing the air-flow for preventing the particles from clogging the filter. The openings may be made in the filtering material by processes such as laser cutting, x-ray lithography, chemical etching, or by stretching a microporous sheet.

Abstract: A system for coupling components of toy assemblages, educational models, hobby constructions, component attachments, or the like together using a compact single point snap together axial connector, which is configured or formed with a key like portion included as part of the male connector part, and a corresponding female connector configured to prevent rotational movement about the connectors axis, and/or to limit the selective attachment of the components.

Abstract: The present invention relates to thiadiazinones of the formula I ##STR1## having a phosphodiesterase-inhibiting action and which are suitable for combating cardiovascular and asthmatic disorders.

Abstract: A shower curtain edge stay to prevent a shower curtain from curling inward. The edge stay in one embodiment is a stiffened longitudinal rib member disposed in the shower curtain adjacent to a lower vertical side edge of the shower curtain and extending parallel to a horizontal edge of the shower curtain.

Abstract: A window air filtering assembly for repulsive filtering of pollen, dirt and small particulate matter. The air filtering assembly includes a frame assembly and a filtering medium disposed in the frame assembly. The filtering medium is formed from woven, smooth-surfaced microfilament strands having at least 16% of its surface area open.

Abstract: A fluid filter has a housing which consists of a top housing half 10 and a bottom housing half 11. Between these two housing halves a filter element is disposed. On the bottom housing half is an inlet for the raw fluid, and on the top housing half is an outlet for the clean fluid. The two housing halves are assembled with snap fasteners.

Abstract: A vascular graft having a pleated circumference accommodates blood pressure changes with minimal change in internal surface area. A highly compliant graft may be made from a wide variety of polymers including non-elastomeric materials.

Abstract: Compounds of formula I ##STR1## in which R.sup.1 and R.sup.2 are each independently of one another H or A,R.sup.3 is H, OA or O--C.sub.m H.sub.2m+1-n X.sub.n,R.sup.4 is --O--C.sub.m H.sub.2m+1-n X.sub.n,X is F or Cl,A is alkyl having 1-6 C atoms,m is 1, 2, 3, 4, 5 or 6 andn is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 or 13, and their salts have positive ionitropic activity and vasodilating action, and promote circulation. In addition, the compounds can be employed for the treatment of asthmatic disease and memory disorders, and have anti-depressive and anti-inflammatory properties.

Abstract: Pharmaceutical medications and methods are disclosed for providing instant and sustained relief from pain or symptoms associated with episodic heartburn in humans. The medications consist essentially of antacids and histamine H.sub.2 -receptor antagonists, and may be administered on an as-needed basis in liquid or solid dosage forms. Typical antacids which may be used in combination with the histamine H.sub.2 -receptor antagonist are conventional antacids which are well known and widely used in the treatment of excess acid related gastrointestinal dysfunctions. Exemplary of typical antacids include, sodium bicarbonate, calcium carbonate, magnesium hydroxide and aluminum hydroxide, as well as commercially available high potency, flavored antacids. Histamine H.sub.2 -receptor antagonists which may be used in combination include those conventionally used in the treatment of peptic ulcers, such as, for example, cimetidine, ranitidine, famotidine and nizatidine.

Abstract: A plurality of slitting devices for rolls of sheeting can be clipped onto a dispensing carton so that the sheeting is readily slit to width as it is drawn from the carton. The devices are folded from single flat steel units so as to guard the edges of blades securely when not in use.

Abstract: Receivers for bandspread signals have a carrier PLL (20) for the carrier frequency and phase and a code PLL (20, 30 . . . 34) for the code frequency and phase. To be able to receive even very noisy signals, the carrier PLL, in particular, must have a very narrow bandwidth. This results in a very narrow capture range.According to the invention, instead of employing a complicated search strategy, advantage is taken of the fact that the code PLL locks in more easily. A signal is taken from the code PLL which indicates the difference between the desired value and the actual value of the code frequency. This signal is fed as an additional control signal to the carrier PLL.

Abstract: A sliding caliper comprises a scale having a front end defining a measuring edge, a slide movable over the scale and having a readout display and a measuring tip depending from said scale and having an axis of symmetry passing through the measuring edge.