baber/WOPTO huggingface dataset:
Patent WO-0042800-A1 (WO)
Title: Frequenzbandvergabe an funk-kommunikationssysteme
Inventor: SCHULZ EGON
IPC: H04B7/26
Filed: 2000-01-03
Abstract: Erfindungsgemäß wird davon ausgegangen, daß sich zumindest zwei Funk-Kommunikationssysteme räumlich überlagern und in einem Funk-Kommunikationssystem die Funkschnittstelle zumindest ein erstes und ein zweites Frequenzband umfaßt. Im Sinne der Frequenzvergabe werden einem Funk-Kommunikationssystem mehrere Frequenzbänder nicht blockweise vergeben, sondern zumindest ein Frequenzband eines weiteren Funk-Kommunikationssystems zwischen den Frequenzen des ersten und zweiten Frequenzbands angeordnet. Es liegt also ein Mindestabstand zwischen den an einem Standort verwendeten Frequenzbändern vor. Damit kann im UMTS ein Frequenzband des FDD-Modus in Aufwärtsrichtung auch im TDD-Modus genutzt und asymmetrische Datendienste besser unterstützt werden.
Patent WO-0173702-A1 (WO)
Inventor: KUX ANDREAS
IPC: B42D25/00
Filed: 2001-02-22
Abstract: L'invention concerne un dispositif individuel d'une constitution comportant au moins une première structure et une deuxième structure qui sont orientées l'une vers l'autre. L'invention est caractérisée en ce qu'il est prévu un dispositif de détection de position détectant une position relative de la première structure par rapport à la deuxième structure, en vue de constater qu'une manipulation a été faite sur le dispositif.
Patent WO-0213200-A1 (WO)
Title: Strom-abtast-halte-schaltung, analog-digital-wandler und verfahren zum betreiben einer strom-abtast-halte-schaltung
Inventor: PAULUS CHRISTIAN
IPC: G11C27/02
Filed: 2001-08-03
Abstract: Die Erfindung betrifft eine Strom-Abtast-Halte-Schaltung mit mehreren Teilschaltungen, in denen ein Stromsignal gespeichert wird, wobei wenigstens eine der Teilschaltungen einen Schalter enthält. Erfindungegemäss zeichnet sich die Strom-Abtast-Halte-Schaltung dadurch aus, dass die Teilschaltungen jeweils wenigstens einen linearen Widerstand enthalten, der so geschaltet ist, dass das Stromsignal an einem Widerstand einen Spannungsabfall erzeugt, dass die Teilschaltungen jeweils wenigstens einen invertierend betriebenen Regelverstärker enthalten, der in einer Halte-Betriebsart einen Ausgangsstrom der Schaltung einstellt, der einen Spannungsabfall über den Widerstand zur Folge hat, der im Wesentlichen so gross ist wie der Spannungsabfall über den Widerstand vor der Halte-Betriebsart.
Patent WO-0221610-A1 (WO)
Title: Plasmaverkapselung für elektronische und mikroelektronische bauelemente wie oleds
Inventor: HUNZE ARVID
IPC: H01L33/26
Filed: 2001-08-31
Abstract: Die Erfindung betrifft eine Plasmaverkapselung für elektronische und mikroelektronische Bauteile wie OLEDs. Dabei kommt jedoch nicht ein herkömmlicher Standardprozess zur Plasmabeschichtung zum Einsatz, sondern es wird ein besonders schonendes Plasmabeschichtungsverfahren, wie z.B. die gepulste Methode oder die 'remote' oder bzw. 'after-glow-methode' verwendet, durch das keine Schäden an empfindlichen Bauteilen wie einem OLED entstehen.
Patent WO-0246601-A1 (WO)
Title: Kraftstoffeinspritzsystem für brennkraftmaschinen
Inventor: EGLER WALTER
IPC: F02M55/04
Filed: 2001-12-05
Abstract: Kraftstoffeinspritzsystem mit einem Kraftstoffeinspritzventil (15) und einem Steuerventil (50), welches Steuerventil (50) ein in einer Steuerventilbohrung (52) längsverschiebbares Steueventilglied (54) aufweist. Am Steuerventilglied (54) ist eine Steuerventil dichfläche (55) ausgebildet, die mit einem Steuerventilsitz (56) zusammenwirkt und so die Verbindung von einem ersten Druckraum (57) zu einem zeiten Druckraum (58) steuert, wobei der erste Druckaum (57) mit einem Hochdrucksammelraum (10) verbunden ist. In einem Ventilkörper (25) ist eine Bohrung (30) ausgebildet, in der eine kolbenförmige Ventilnadel (32) mit ihrem brennraumseitigen Ende die Öffnung wenigstens eine Einspritzöffnung (38) steuert, indem sie druckbeaufschlagt durch den Druck in einer Druckkammer (31) eine Längsbewegung durchfährt, wobei zweiten Druckraum (31) über einen Zulaufkanal (28) ,it dem zweiten Druckraum (58) verbunden ist. Der erste Druckraum (57) ist über eine Drossel (72) mit einem als Sackbohrung ausgebildeten und ansonsten abgeschlossenen Dämpfungsraum (70) verbunden, wodurch auftretende Druckschwingungen beim Schliessen des Steuerventils (50) rasch abgedämpft werden.
Patent WO-2004016712-A1 (WO)
Inventor: HAUPTVOGEL MANFRED
IPC: C09D5/18
Filed: 2002-08-02
Abstract: The invention relates to a flame-proofing agent based on a modified unsaturated oil to which other flame-inhibiting chemical substances such as boron and phosphorous compounds can be added in order to improve the flame-resistant properties thereof. The fungicidal qualities thereof are improved by adding terpenes to the mixture. The invention also relates to a method for the production of said flame proofing agents and the use thereof.
Patent DE-1810392-A1 (DE)
Title: Sluice for textile wet treatment in rope form
Inventor: MENZEL KARL
IPC: D06B23/16
Filed: 1968-11-22
Abstract: Two tubular valves are spaced from each other in a material guide tube, and the region between them has an extraction lid or the like.
Patent DE-1907761-A1 (DE)
Title: Permanent-magnetic sterilizing device for - the food and drink industry
Inventor: FRIEDRICH NAGEL WILHELM
IPC: A23L3/26
Filed: 1969-02-15
Abstract: The interaction between controlled quadripolar combination magnets which rotate in different directions and at different speeds releases magnetically charged particles. Specifically the possibility of controlling the quadripolar combination magnets permits free penetration of the volumes or bodies of media to be treated by the magnetic field.
Patent DE-1909876-A1 (DE)
Title: Prod of acylated glycoluril
Inventor: DIETER KUEHLING DIPL-CHEM DR
IPC: C07D487/04
Filed: 1969-02-27
Abstract: (A) Process for prepn. of acylated glycolurils of formula (I):- (where of R1, R3, R4 and R6 at least one, pref. at least two are C2-10 acyl and the others are H and/or lower alkyl, R7 and R8 are H and/or organic C1-C10 residues) by reacting a glycoluril of formula (II): -(where R1', R3', R4,' and R6' are H and/or lower alkyl) with carboxylic acid anhydrides or halides with 2-10, pref. 2-8 C atoms in the acyl residue, in the presence of a catalyst at 20-140 degrees C., pref. 40-120 degrees C. at atmospheric pressure. (B) Cpds. (I) where: (i) R7=R8=H, R1=R4=CH3CO, R3=R6=C3H7CO, C2H5CO (ii) R7=R8=H, R1=R4=C3H7CO, R3=R6=C2H5CO (iii) R7=R8=H, R1=R4=C6H5CO, R3=R6=CH3CO (iv) R7 = R8 = CH3, R3=R6=H, R1=R4=C2-10 acyl (v) R7=R8=C6H5, R3=R6=H, R1=R4=C3-10 acyl. Products are used as activators for cpds. donating active oxygen. Application of acid catalysts, leads to a large improvement in process, compared to alkali acetate, and permits 7,8-substd. glycolurils to be easily acylated. Acid catalyst is pref. H2SO4 or HClO4 and is used in amts. of 0.001-0.5 parts, esp. 0.01-0.2 parts, per part of glycoluril. Solvent may be the free acid corresp. to the acylating agent, or an inert solvent such as dioxan, diethylene glycol, dimethyl ether, benzene, toluene or xylene.
Patent DE-1911211-A1 (DE)
Title: Cable junction for cables with polyethyl- - ene insulation
Inventor: KLAUS DUESSEL DIPL-ING
IPC: H02G15/105
Filed: 1969-02-28
Abstract: Tapes of an ethylene-olefin-copolymer are wound from the insulation of one cable end over the bared conductor ends, which are joined by a soldered conductive sleeve, up to the insulation of the other cable end. After vulcanisation or polymerisation the whole is sheathed in epoxy resin. The adhesion of epoxy resin can be improved by a cyanoacrylnitrile adhesive over the insulation ends.
Patent DE-1916019-A1 (DE)
Title: Gas fried cupola with auxiliary arc heater
Inventor: A CERNYJ ANATOLIJ
IPC: F27B1/08
Filed: 1969-03-28
Abstract: Furnace has an electric arc in the superheating chamber for superheating the metal drops along the path covered by the liquid metal. Specif. the shaft is subdivided by two projections into a melt chamber for raw material and a superheating chamber for metal, with burners in the furnace wall and a asin on the furnace floor for collecting the liquid metal. In the super heating chamber are two pairs diametrically opposed electrode situated above the burners, for producing an electric arc.
Patent DE-1933427-A1 (DE)
Title: 2,6-Bis-(dialkanolamino)-8-aminopyrimido-(5,4,d)-pyrimidines
Inventor: JOSEF ROCH DIPL-CHEM DR
Filed: 1969-07-01
Abstract: 5,4-d pyrimidines of formula (I): (where R1 = 1-3C alkyl, allyl or PhCH2; R2 = 1-3C alkyl or allyl; or R1 + R2 = piperidino opt. substd. by 1 or 2 1-2C alkyl, 1,2,5,6-tetrahydropyridino, hexa- or hepta-methyleneimino, 3,6-ethylene-hexamethyleneimino, indolino or 1,2,3,4-tetrahydroisoquinolino; R3, R4 = 2-3C hydroxyalkyl), ae new compds. showing a cardiovascular effect and having a strong inhibiting action on platelet aggregation. Prefd. cpds. include 2,6-bis(ethanolpropanolamino)8-diethylaminopyrimido 5,4-d pyrimid- ine (IV).
Patent DE-1942288-A1 (DE)
Title: Expanding textile yarn package
Inventor: BOUS KARL
IPC: B65H49/36
Filed: 1969-08-20
Abstract: The hank expander features superimposed sword like arms with spring tensioned yarn supporting strips. The latter are set on the arms before the insertion into the spool, or by bringing first the strips into the opening of the coil and then inserting the expander arms. The strips may be of angle iron or plastic, while the support is made of wood, plastic or metal.
Patent DE-1947256-A1 (DE)
Title: Orotic acid derivatives with improved water - solubility
Inventor: RAMBACHER PAUL DIPL-CHEM DR
IPC: C07D239/54
Filed: 1969-09-18
Abstract: Orotic acid derivatives of type where R1, R2 = either or both a (possibly arylated) 2-hydroxyalkyl group with 2-5C atoms. and if not, either H or C1-3 alkyl, and Z = H or a cation, together with the S-lactones of compounds hydroxyalkylated on N-1, have much higher aq. solubilities than orotic acid and its salts, and are thus superior for pharmaceutical use. The preferred compounds are potassium 3-(2-hydroxpropyl) orotate (126g/100 ml H2O) and 1-(2-hydroxyethyl)-3-methyl-orotic acid lactone; compare Na orotate 0.36g/100 ml H2O. The compounds are made by treatment of orotic acid or its N-alkyl derivatives in alkaline solution with a 1,2-epoxide, followed by lactonisation with strong acid (and separation of the N-1 and N-3 derivatives, if appropriate, by treatment with buffer or pH 4-4.5, when the lactone remains undissolved.
Patent DE-1949778-A1 (DE)
Title: Descaling of bauxite decomposition plant - with mixed acid
Inventor: WINKHAUS GUENTER DR
IPC: C01F7/0626
Filed: 1969-10-02
Abstract: Plant, except tubular type, is free from scarcely-soluble scale using acid mixture of HCl and HF, pref. containing 2-8, esp. 3% HCl and 2-10, esp. 3% HF, at elevated temp. e.g. about 80 degrees C, and pref. with agitation, e.g. stirring. Even scale containing Ti can be removed rapidly and efficiently using this method.
Patent DE-1950349-A1 (DE)
Title: adamantyl thiadiazoles. antifungals
Inventor: LAKSHMI NARAYANAN VENKATACHALA
IPC: C07C61/135
Filed: 1969-10-06
Abstract: Adamantyl thiadiazole derivs. I, and acid addn. salts R=H, hal, trihalomethyl, lower alkyl, lower alkoxy, Ph, NH2, lower alkanoylamino, mono- or di-lower alkylamino B=Basic N-contng. radical NR1R2, where R1 and R2=H, opt. substd. adamantyl, lower alkyl opt. substd. by OH, Ph,N-(lower alkyl)phenyl; cyclo-lower alkyl, alkanoyl; or NR1R2 may be a 5-7 membered monocyclic heterocyclic ring opt. contng. additional heteroatoms, and opt. substd. by e.g. alkyl Preferred cpds. have R=H and B=NMe2. I are topical fungal disinfectants against e.g. Aspergillus niger, Chaetomium globosum. I are applied, as a 1% cream or ointment, 2-4 times daily.
Patent DE-2023919-A1 (DE)
Title: Bioelectrically active fabric for improved health - permitting normal resistance distribution over skin by electro magnetic ray application
IPC: A61N1/16
Filed: 1970-05-15
Abstract: The knitted rows of non-electrically conductive fibre loops have conductive fibre components spaced from each other in them, whereby the space (a) between two parallel rows of loops (5) of electrically conductive material is 0.3 - 3.5 mm. whilst the distance (b) between two adjacent loops (6) in the same row is 0.3 - 3.5 mm. Pref. the conductive material is stainless steel. The conductive fibre component can be mixed with the non-conductive fibre components in the form of staple fibres. The metallic proportion of the conductive fibres is 0.5 - 2.0%, espec. 1.0% by weight. Distance (a) is specifically 2.1 mm and distance (b) 0.7 mm. The material can be used e.g. in garments, bed clothes or as binding cloths.
Patent DE-2055660-A1 (DE)
Title: Feeding plastics blanks , - for blow moulding , using a pivoted base
IPC: B29C49/06
Filed: 1970-11-12
Abstract: The bag plate supports a core for an injector to develop a blank, and after injection the base plate is pivoted to one side up to 90 degrees to load the blank into a blow-moulding unit. The purpose is to provide a fully automatic blow moulding loading system which is controlled by the development of the thermoplastic blanks, rather than by a complicated time cycle.
Patent DE-2055728-A1 (DE)
Title: Gasoline and jet fuel production
IPC: C10G47/16
Filed: 1970-11-12
Abstract: Prodn. is by (a) reacting a charge stock which contains S with H2 at below 850 degrees F and above 1000 p.s.i.g. in the presence of a catalyst, (b) separating the effluent at the same pressure and 550-750 degrees F in a vaporous phase I and a liquid phase II, (c) separating I at the pressure and 60-140 degrees F into a H2-rich vapour phase III and a liquid phase IV, (d) reacting II with a siliceous/Group VIII metal catalyst at 800 degrees F and above 1000 p.s.i.g. (e) separating the effluent from (d) at the same pressure and 60-140 degrees F into a H2-rich vapour phase V and a liquid phase VI, (f) passing IV and VI to a fractional distillation zone to provide a phase having an initial boiling point of 500-600 degrees F and recovering a gasoline and jet fuel fraction.
Patent DE-2100421-A1 (DE)
Title: Self-supporting prefab element - for shell-type roof structures
IPC: E04B7/10
Filed: 1971-01-07
Abstract: Two corrugated sheet metal shells are bonded together by hardenable polyurethane foam into a self-supporting element under simultaneous increase of the sheet metal shell bearing capacity and stability.
Patent DE-2102315-A1 (DE)
Title: Thermoplastics tubing prodn
IPC: B29C48/90
Filed: 1971-01-19
Abstract: A downwardly extruded thermoplastic tube is treated with an upward flow of gas to prevent condensation of thermoplastic components and to reduce the tube diameter to just greater than that of a lower mandrel. The tube is further cooled during its passage over the mandrel by a continuous upward turbulent flow of coolant liquid through an annular bath surrounding the mandrel. The coolant liquid exerts sufficient pressure to force the inner face of the tube against the mandrel vibration of the tube is reduced preventing rupture and deformation of its surface.
Patent DE-2108138-A1 (DE)
Title: Nut cleaning machine
IPC: A23N5/00
Filed: 1971-02-19
Abstract: Shelled nuts are conveyed on a grooved belt which travels under a suction hood housing sets of brushes with suction outlets between the sets of brushes. The feed hopper one end, and the discharge hopper at the other end, each has its suction opening, and all suction openings contain an adjustable flap. The gap between the brushes and the nuts passing underneath can be adjusted.
Patent DE-2114844-A1 (DE)
Title: 1-acyl-5-phenyl-1h-1, 5-benzodiazepine -2, 4-(3h, 5h)-diones prodn - - useful as psychosedatives, muscle relaxants and anticonvulsants
IPC: C07D243/12
Filed: 1971-03-26
Abstract: Title cpds. of formula (I): where R' = H, (1-15C) alkyl, halomethyl, cyclohexyl, Ph opt subst. by one or two hal, Me, MeO, or NO2, PhCH2, styryl, or a five membered O or S heterocyclic, R2 = H, hal, CF3 or NO2, and R3 = hal or CF3, are prepd. by a single step acylation of the corresp. N'-acyl, N2-acyl, o-phenylenediamine with a malonic acid dihalide.
Patent DE-2121033-A1 (DE)
Title: Colouring plastic articles - by adding dye to the melt in the extruder
IPC: B29C48/03
Filed: 1971-04-29
Abstract: Granulated, pref. colourless, thermoplastic material is supplied to a melt chamber where it is heated to produce the melt, and measured quantities of dye are supplied to the melt chamber and mixed with the melt pref. using a paddle, the melt then being fed to an extrusion head by a screw feed. Pref. the dye is supplied to the melt chamber by an electromagnetically operated diaphragen dosing pump which is controlled in dependence on the feed rate of the screw feed to produce a continuous flow of uniform colour density. The necessity of stocking a large variety of different colour granular plastic material is eliminated.
Patent DE-2135116-A1 (DE)
Title: Wood shredding - by metal spikes in rubber cladding on a cylinder to give coarse fibre material
Inventor: VOELSKOW PETER
IPC: B27L11/08
Filed: 1971-07-14
Abstract: Pressure is applied to the wood or wood pulp in a feed channel, with water/steam inlets, to press the material against the spikes of the shredding drum. The purpose is to develop coarse fibre material more efficiently and with lower energy consumption than with conventional abrasive stones.
Patent DE-2140080-A1 (DE)
Title: Bleach clay residues utilization - from oil refining processes by stirring with hydrocarbons, alkanols and aq alkalis
Inventor: SCHICK PAUL
IPC: B01J20/12
Filed: 1971-08-10
Abstract: 1 part of the filter cake residue left from refining vegetable, animal or mineral oils with bleaching clays e.g. montmorillonite, is stirred with 0.25-0.70 parts hydrocarbon solvent (A) and 0.1-0.2 parts of a lower alkanol (B), and the slurry carefully stirred with an aq. alkaline soln. (C) so that a phase separation occurs. The liquid phase is removed and a solid phase of clay which is capable of swelling obtained. (A) is pref. white spirit, (B) is methanol and (C) is 5-15% soda soln. or a soln. of secondary or tertiary amine opt. contg. hydroxyl groups. Oil and solvent can be recovered from the liquid phase by evaporation. The clay obtained is suitable as a binder for mineral particles e.g. for mfr. of foundry moulds, pelletising of ores, production of road surfaces, and also for mixing with asphalt, bitumen, resins, etc. for water-proofing of buildings, mfr. of roofing papers, etc.
Patent DE-2160253-A1 (DE)
Title: Thermal insulating joints - constructed by extrusion of plastics material into a frame member channel
Inventor: HOLLIDAY WILLIAM HERMAN
IPC: E06B3/267
Filed: 1971-12-04
Abstract: Straight rigid frame member, e.g. for a window or glass door unit, is resiliently engaged between a drive member and a back-up member to feed the frame member beneath a head assembly having a nozzle which dispenses thermal insulating materials into a channel in the frame member. Pref. an adjustable guide block assembly is provided to engage and positively locate a number of different frame members for rectilinear movement past the dispensing head.
Patent DE-2166772-A1 (DE)
Title: Monolithic integrated cct. - with leakage current compensating arrangement and current source with vertical NPN transistor across differential amplifier output
Inventor: SEILER HARTMUT DIPL PHYS
IPC: H03K17/14
Filed: 1971-09-22
Abstract: The circuit has a current source which includes a vertical NPN transistor connected across the output of a differential amplifier in the form of an ideal operational amplifier. A control voltage is applied via a resistor to the non-inverting input of the amplifier, and via a second resistor to the transistor. Alternatively, the transistor may be replaced by a Darlington pair comprising two vertical NPN transistors, and the current amplification of either the transistor or Darlington pair is very high. The output current is equal to the control voltage divided by the resistance value of the second resistor. Close coupling of the circuit elements results in the leakage current compensating circuit remaining inefficient at low crystal temperatures, thus avoiding the undesirable side-effects of the compensation elements.
Patent DE-2166902-A1 (DE)
Title: Rocket power gas system with fuel and oxidant containers - has containers manufactured from materials, non reactive with fuel or oxidant
Filed: 1971-12-01
Abstract: A power system for a rocket consists of a drive gas generator, containers for oxidant and fuel, a drive gas addition, distribution and injection system, a multiple burner chamber with attached sliding nozzles and a control block with programmer device. The oxidant and fuel containers are manufactured from materials inert to these substances and filled with drive gas components during the storage. The oxidant and/or fuel are separated from the container walls by flexible jackets or bladders and the floor of the oxidant and fuel containers are made from oxidant and fuel inert welded sections.
Patent DE-2238119-A1 (DE)
Title: Dough portion rising plant - with automatic transfer mechanism to tunnel oven conveyor
Inventor: GRAESSLE KARL
IPC: A21B3/07
Filed: 1972-08-03
Abstract: The troughs in which the dough portions are carried through the controlled temp and RH rising chamber are carried down a first vertical chain convey or and taken over by horizontal chain conveyor in a horizontally oscillating frame which is advanced over and withdrawn from the tunnel over conveyor belt. As each trough passes round the nose end of the frame, a variable slope tilting plate is lowered on radial arms to just above the oven conveyor belt and as the dough slides out of the troughs, the uncooked loaves are tilted back to the upright position by the plate position where mechanism is mechanically synchronized labour saving.
Patent DE-2253606-A1 (DE)
Title: Reed mounting in double-pile loom - with adjustable bolt in upper bracket for height adjustment
Inventor: MERTENS HANS-HUBERT
IPC: D03D49/60
Filed: 1972-11-02
Abstract: The toothed reed is mounted to the upper bracket by a bolt riding in a slit, while the mounting in the lower bracket is by a screw and a lock but. This allows an adjustment for the relative positioning of the teeth of the toothed reed against the upper and lower woven layers, with few hand movements, and with easy reed replacement on a change of pile height.
Patent DE-2319239-A1 (DE)
Title: 4-piperazinylisoquinoline compsns - positive intropics
Inventor: SIMPSON WILLIAM RONALD JAMES
IPC: A61K31/00
Filed: 1973-04-16
Abstract: Title cpds are of formula (I): where R' and R2 = H, OH, 1-6C alkyl, or 1-5C alkoxy; or R'+R2 = -CH=CH-CH=CH- or 1-4C alkylenedioxy; R3 = R4 = H, 1-6C alkyl, and R4 also = 3-6C alkenyl, 6-10C aryl, (opt. subst. by 1 or 2, 1-6C alkoxy, F or Cl,) 2-6C alkanoyl, 2-7C carbalkoxy, 4-7C carbalkenyloxy, or 7-11C carbaryloxy, and R' and R2 may not both be t-alkyl or t.alkoxy bonded directly via the t. C-atom.
Patent DE-2329089-A1 (DE)
Title: Petroleum coke drying and calcination - in rotary kiln using hot waste gases for drying
Inventor: FAUTZ GERD FRIEDRICH
IPC: C10B57/10
Filed: 1973-06-07
Abstract: Petroleum coke can be dried and calcined in a rotary kiln after it has been dried by recovery of the waste heat from the hot lean gas leaving the kiln. These hot gases are drawn in counterflow upwards through the petroleum coke descending in a cylindrical vessel. They pass preferably through a coke breeze and dust separating chamber and a combustion chamber before they enter te drying vessel. This reduces the costs for drying the crude petroleum coke to a minimum. The process is readily controlled and combines simple appts. with a minimum of moving or wearing parts and a minimum of maintenance.