baber/WOPTO huggingface dataset:
Patent EP-0200705-A3 (EP)
Title: Automatic disc loading and unloading mechanism for record player apparatus
IPC: G11B17/04
Filed: 1986-04-22
Abstract: The device comprises at least three conical elements (24A, 24B, 24C) which engage with the disc edge and which are positioned at the vertices of a triangle with mechanically variable geometry whose sole linear displacement provides the horizontal and vertical transfers of the disc (D) from its insertion to its operative position and vice versa.
Patent EP-0245715-A3 (EP)
Title: Apparatus for the treatment of liquids containing impurities, residues and/or ageing products
IPC: B01D36/04
Filed: 1987-04-30
Abstract: The apparatus for purifying and reprocessing coolants and/or lubricants is to be further developed in such a way that the reprocessing steps, which become necessary during quasi-continuous operation, of the filter media can be carried out at low cost in terms of personnel, apparatus, material and disposal. For this purpose, a backwashing circulation which is to be effective cyclically for at least two membrane filters is provided, the discharge thereof leading into a settling tank which is provided with a take-off for sediments, and whose overflow is returned into the coolant and/or lubricant circulation.
Patent EP-0264544-A3 (EP)
IPC: G06M1/16
Filed: 1987-06-20
Abstract: Das Nullstellen oder das Stellen auf eine andere 
Zahlenkombination eines Rollenzählwerks wird dadurch 
ermöglicht, dass aus einer Schaltrollen (5) oder 
Zahlenrollen (4) tragenden Achse ein Distanzstück (8) entfernt 
wird und dadurch mindestens eine Zahlenrolle (4) von den 
entsprechenden Schaltrollen (5) entkoppelbar ist, so dass die 
Einstellung der Zahlenrollen (4) darnach vorgenommen werden 
kann. Ein nicht gewolltes Entkoppeln der Zahlenrollen (4) von 
den zugehörigen Schaltrollen (5) ist nicht möglich.
Patent EP-0254914-A3 (EP)
IPC: G06K19/04
Filed: 1987-07-06
Abstract: Die Erfindung bezieht sich auf eine Magnetcodierleiste 
aus Kunststoff, in der in zylinderförmigen in Reihe ne­
beneinanderliegenden Öffnungen umklappbare Magnetscheib­
chen gelagert sind, die an ihren Stirnflächen unter­
schiedliche Polarisierung aufweisen, und die in ihrer 
jeweiligen Endlage von Haftplättchen aus einer Schicht 
eines weichmagnetischen Pulvers bestehen, durch Weich­
magnetschluß gehalten werden. Bekannte Leisten dieser 
Art haben Nachteile bezüglich ihrer Stabilität und durch 
das spannabhebende Herstellverfahren treten Oberflächen­
rauhigkeiten in den Öffnungen für die Magnetplättchen 
ein, die zu Fehlfunktionen Anlaß geben. Die Erfindung 
beseitigt diese Nachteile dadurch, daß die Magnetcodier­
leiste aus zwei Kunststoffteilen 1, 2 aus Spritzguß und 
einem die beiden Kunststoffteile umfassenden U-förmig 
ausgebildeten Metallbügel 3 besteht. Das eine Kunst­
stoffteil 1 ist ebenfalls U-förmig ausgebildet und die 
Haftplättchen auf seiner Innensohle 5 sind entsprechend 
der Anzahl der Magnetscheibchen 6 in Vertiefungen 7 ein­
gelegt sind und eine dünnwandige Kunststoffolie 8 darü­
ber gespannt ist, wobei das weichmagnetische Pulver für 
die Haftplättchen 4 im Magnetfeld langsam ausgehärtet 
ist. Die Öffnungen 9 für die Magnetscheibchen 6 befinden 
sich in dem als Leiste ausgebildeten zweiten Kunststoff­
teil 2. Diese Leiste wird mit den Öffnungen 9 nach unten 
in das erste Kunststoffteil 1 eingelegt.
Patent EP-0258728-A3 (EP)
IPC: C08L51/04
Filed: 1987-08-18
Abstract: Gegenstand der vorliegenden Erfindung sind thermo­
plastische Formmassen enthaltend Polydiorganosiloxan-­
Polycarbonat-Blockcopolymere, thermoplastische Copoly­
merisate, halogenfreie Phosphorverbindungen, Tetrafluor­
ethylenpolymerisate und geringe Mengen an Pfropfpoly­
merisaten sowie gegebenenfalls wirksame Mengen an 
Stabilisatoren, Pigmenten, Fließmitteln, Entformungs­
mitteln und/oder Antistatika, sowie Verfahren zu ihrer 
Herstellung.
Patent EP-0261441-A3 (EP)
IPC: F16D69/02
Filed: 1987-08-28
Abstract: Die Erfindung zeigt asbestfreies Armierungsgarn für 
Reibbeläge mit der Zusammensetzung von Stapelfasermischgarn, 
bestehend aus 60 bis 90 Gew.-% thermisch stabilen Fasern und 
10 bis 40 Gew.-% thermisch instabilem Material, wobei das 
Armierungsgarn wie übliche Stapelfasergarne 
weiterverarbeitbar ist und zumindest die thermisch stabile 
Komponente in Form von Filamenten oder Garn vorliegt, wobei 
die homogene Verteilung Zusammensetzung des 
Stapelfasermischgarns erreicht wird, indem die ganz oder 
teilweise fehlende Komponente des Armierungsgarns statt in 
Faserform in Form einer Tränkung und/oder eines Überzuges 
auf den Ausgangsfilamenten oder dem Ausgangsgarn vorliegt. 
Das Garn wird hergestellt, indem man das zumindest die 
thermisch stabile Komponente enthaltende Ausgangsmaterial in 
Form von endlosen Fäden oder Garn mit der thermisch 
instabilen Komponente und/oder der fehlenden Menge an 
thermisch stabiler Komponente in Form einer Tränkung 
und/oder eines Überzuges in an sich bekannter Weise versieht.
Patent EP-0263326-A3 (EP)
Title: Process for preparing aqueous concentrated dispersions of polymers based on vinylic and/or acrylic esters
IPC: C08F20/12
Filed: 1987-09-12
Abstract: A process wherein the monomers are polymerised in a conventional manner with a small amount of a selected phosphoric acid triester being employed as an additional emulsifier. The dispersions prepared by this process contain a relatively small amount of total emulsifier but nevertheless have low viscosity and a long shelf life.
Patent EP-0264108-A3 (EP)
Title: Connecting element for optical waveguides
IPC: G02B6/38
Filed: 1987-10-13
Abstract: A connector element, which is composed of two carrier members with cover plates that are held in alignment by guide rails received in guide channels of the member, is provided with an arrangement of collecting surfaces for collecting excess adhesive materials and immersion fluids to keep these fluids and materials from the guide channels of the carrier members. The collecting surfaces can be formed by parting webs, by grooves in the carrier members, or beveled edge surfaces of the cover plates of each carrier member.
Patent EP-0264928-A3 (EP)
IPC: G03C1/73
Filed: 1987-10-21
Abstract: Die Erfindung betrifft Verbindungen der allgemeinen Formel I 
  
in der die Symbole  
n      unabhängig voneinander die Zahlen 0, 1 oder 2,  
m      die Zahlen 0 oder 1,  
A⊖      ein Anion, die Reste  
X      unabhängig voneinander Wasserstoff, Methyl oder Ethyl und die Reste  
R      unabhängig voneinander Wasserstoff, gegebenenfalls substituiertes 
Alkyl, Cycloalkyl oder Aryl oder zwei benachbarte Reste R auch eine 
Alkylengruppe oder zusammen mit den C-Atomen, an die sie gebunden 
sind, einen ungesättigten oder aromatischen Ring bilden, mit der 
Maßgabe, daß mindestens ein n von 0 verschieden ist.
Patent EP-0273274-A3 (EP)
IPC: C08F8/50
Filed: 1987-12-11
Abstract: Polyethylen, vorzugsweise Polyethylen hoher Dichte, wird mittels 
Radikalbildner (z. B. Peroxide, Azoinitiatoren, C-C-spaltende Ini­
tiatoren), gegebenenfalls in Gegenwart von Verbindungen von Metallen 
als Cokatalysatoren bei Temperaturen über 300°C abgebaut (modifiziert).
Patent EP-0240108-A3 (EP)
IPC: G06F9/38
Filed: 1987-02-03
Abstract: Means for executing operations on electronic 
data comprises a stack means for performing numerical 
operations functionally situated between the top 
stack and the next on stack so that operands on which 
an operation is to be performed are automatically 
present at inputs of the means for performing the 
operations.
Patent EP-0245954-A3 (EP)
Title: Use of etodolac for lowering uric acid blood levels
IPC: A61K31/405
Filed: 1987-04-10
Abstract: A method is disclosed for lowering uric acid blood levels by administering an effective amount of etodolac.
Patent EP-0247793-A3 (EP)
IPC: H01J31/20
Filed: 1987-05-21
Abstract: A cathode-ray tube (10) has a faceplate panel (12) joined 
to a funnel (14) along a sidewall (16) of the panel, and an inter­
nal magnetic shield (42) disposed proximate an inner surface 
(22) of the funnel and connected along one end (44) thereof to 
a back portion (28) of a shadow-mask frame (30) oriented or­
thogonally to a central axis (Z) of the tube and supported adja­
cent the sidewall. An apertured shadow mask (36) is connect­
ed along an edge (38) thereof to a front portion (40) of the 
shadow-mask frame opposite the back portion. Along the di­
rection of the central axis, the one end of the magnetic shield 
overlaps the corresponding edge of the shadow mask around 
substantially all of the shadow-mask frame.
Patent EP-0256886-A3 (EP)
IPC: A61B5/08
Filed: 1987-08-18
Abstract: Myocardial electrical stability is assessed by 
sampling an ECG waveform at corresponding fiducial 
locations for a plurality of beats and creating a 
scatter plot (12) of the ith sample versus the (i-1)th 
sample. A parameter λ is determined (14) which minimizes 
the sum of the total distances of the points of the 
scatter plot to an equation  
x(i) = 4 λ x(i-1)[1-x(i-1)]. The value of the 
parameter λ is related to the electrical stability of 
the heart.
Patent EP-0260941-A3 (EP)
IPC: A46D1/00
Filed: 1987-09-16
Abstract: An anti-fungus, deodorant fiber material comprises 
synthetic polymer fibers, a deodorant material in an 
amount of 8% by weight or more and consisting of an 
ethylene-ethylenically unsaturated carboxylic acid 
copolymer, and an anti-fungus material in an amount of 
1% by weight or more and consisting of fine copper 
particles preferably having a size of 50 mesh or smaller, 
and the deodorant material and the anti-fungus material 
are contained together in the synthetic fibers or the 
deodorant material is contained in one type of synthetic 
fibers and the anti-fungus material is separately 
contained in another type of synthetic fibers.
Patent EP-0261928-A3 (EP)
Title: Method and apparatus for the microwave joining of ceramic items
IPC: B01J19/12
Filed: 1987-09-22
Abstract: Two items, especially one ceramic and the other ceramic or metal, are joined together by applying single mode microwave radiation only to the joint area, simultaneously applying compressive forces to the items in order to force such items together, and continually non-destructively monitoring the joint being formed between the two ceramic items. Preferably, the joint formation is monitored by measuring the responses of the joint to acoustic stimulations; by detecting and monitoring spontaneous acoustic emissions from the joint; or by measuring stimulated acoustic emissions from the joint.
Patent EP-0277570-A3 (EP)
Title: Process for deinking printed waste paper
IPC: D21C5/02
Filed: 1988-01-25
Abstract: A procedure wherein printed waste paper is treated in a pulper under alkaline pH conditions by means of an alkali metal silicate, oxidising bleaching agents, higher fatty and/or resin acids and dispersants and the released particles of printing ink are separated from the suspension of fibres by flotation, where the fatty and/or resin acids are used in the form of their alkaline earth metal salts finely distributed together with dispersants in an oil-in-water dispersion which is liquid at room temperature.
Patent EP-0279442-A3 (EP)
IPC: B29L31/34
Filed: 1988-02-18
Abstract: The surface smoothness and adhesion to metal of poly(arylene 
sulfide) is improved by the addition of an effective amount of a silica 
composition.
Patent EP-0291762-A3 (EP)
Title: Metal-clad, gas filled, multiphase high voltage switchgear
IPC: H01H33/02
Filed: 1988-05-04
Abstract: In a metal-clad, gas-filled, multiphase high-voltage switch gear, having a partition (12) between the busbar chamber (21) and the switch chamber (14), the connection between the two chambers (14, 21) takes place via ducts (13) inserted diagonally in the partition (12), which ducts (13) are arranged in the one direction in the spacing of the busbars (1) and, in the other direction, in the spacing of the poles (6) of the circuit breaker or load isolator (9). As a result, straight-line, crossing-free connections are possible in the busbar chamber (21), between each busbar (1) and the associated duct (13), via the respective isolating or three-position switch (8), while the connecting lines (15a, b, c) in the switch chamber (14) run to the poles (6) in mutually parallel planes, once again without crossing. 
<??>Apart from minimising the switch gear dimensions and increasing the electrical strength as a result of the diagonal arrangement in the busbar chamber (21), in conjunction with a square housing (20), the installation of earthed separating walls (22, 32) between the phases in the two chambers (14, 21) allows effective reinforcement of the outer walls (17) and, above all, the partition (12) to be achieved. Likewise, in the event of a fault, phase shorts with high current arcs are prevented. The stated advantages can also be used in the case of separated multiple busbar systems. 
<IMAGE>
Patent EP-0290951-A3 (EP)
IPC: G01R15/18
Filed: 1988-05-05
Abstract: Die Erfindung betrifft eine Stromwandler-Schaltung, die 
aus zwei Teilwandlern (W1, W2) besteht, auf die ein zu 
messender Strom I aufgeteilt wird. Eine geeignete Dimen­
sionierung der Primärwicklungen (3, 4, 5, 6) und eine 
Verknüpfung der Sekundärsignale beider Teilwandler (W1, 
W2) bewirkt eine Beseitigung des durch die Stromteilung 
verursachten Temperatureinflusses auf das Übersetzungs­
verhältnis der Wandlerschaltung. Eine derartige erfin­
dungsgemäße Schaltung eignet sich insbesondere für 
Strommeßaufgaben, bei denen ein nicht aufgeteilter Strom 
im Strommeßwandler eine Sättigungsmagnetisierung verur­
sachen würde. Ein wichtiges Anwendungsbeispiel für die 
Anordnung sind mischstrombelastbare Prüfzähler für die 
Elektrizitätszählerprüfung.
Patent EP-0292940-A3 (EP)
IPC: H01L39/24
Filed: 1988-05-25
Abstract: A superconductive ceramics represented by the 
general formula: Z₁Ba₂Cu₃O₇. Here, Z is a mixture of a 
plurality of rare-earth metals including scandium and or 
ytterbium mixed in a prescribed ratio. As a high-­
temperature superconductor this substance exhibits a high 
critical current density.
Patent EP-0309870-A3 (EP)
IPC: C07D319/06
Filed: 1988-09-20
Abstract: New liquid crystalline compounds containing the 
bicyclo[2,2,2]octane ring and the phenylisothiocyanato group 
in their molecules of the general formula 1: 
  
wherein: R is a normal or branched alkyl H 2n+1 C n - or 
alkenyl H 2n-1 C n - group containing up to 15 carbon atoms, 
some of the hydrogen atoms in the alkyl chain being 
sometimes substituted by a fluorine atom, Z is a single bond 
or -COO-, -OOC-, -CH₂O- or -C≡C- group, the ring A is a 
1,4-disubstituted benzene ring or 2,5-disubstituted 
pyrimidine ring or a 2,5-disubstituted pyridine ring or a 
2,5-disubstituted 1,3-dioxane ring, m stands an integer 0 or 
1, X1, X2 and X3 are identical or different and each of them 
denotes a hydrogen atom or a fluorine atom or a chlorine 
 
 
atom or a bromine atom or a cyano group, however, if m=1 and 
the ring A is not a benzene ring then Z is also a -CH₂CO-, 
-CO-CH₂-, -CH=CH-, CHYCH₂-, -CH₂-CHY-, -C₆H₄-CH₂-CHY-, 
-C₆H₄-CHY-CH₂-, or C₆H₄-C≡C- group where Y is a hydrogen 
atom or a fluorine atom or a chlorine atom or a cyano group 
or a methoxy group or a hydroxy group are prepared and used 
as component of liquid crystal mixture. Method manufacturing 
of compounds 1, the liquid crystal mixture containing 
compounds 1 and their use for electrooptical devices are 
described.
Patent EP-0310105-A3 (EP)
IPC: G05D16/06
Filed: 1988-09-30
Abstract: Zur Vermeidung von Partikeln und Feuchtigkeit in den 
prozeßgasführenden Räumen (14, 15) eines Druckreglers 
(19) wird eine Feder (6) im prozeßgasfreien Raum (23) 
angeordnet, die erfindungsgemäß über ein an der 
Niederdruckmembran (11) befestigtes Stellglied (24) auf 
die Niederdruckmembran wirkt (Fig.1).
Patent EP-0314147-A3 (EP)
Title: Process for the synthesis of n,n-dialkyl-hydroxylamines
IPC: C07D295/28
Filed: 1988-10-27
Abstract: The invention relates to a process for the synthesis of N,N-dialkyl-hydroxylamines by reaction of the corresponding dialkylamine with H2O2, said reaction being carried out in the presence of a catalyst based on titanium-silicalite.
Patent EP-0316758-A3 (EP)
Title: Method for the automatic optimization of the recording current for the recording of a video signal, and device for carrying out the method
IPC: H04N5/782
Filed: 1988-11-10
Abstract: The recording current necessary for recording a video signal is always to be optimally selected and adjusted with respect to the replay sensitivity, having regard to an audio signal already recorded on the same tracks and having regard to tolerances of the recording medium, of the heads and of the head amplifiers, by means of the novel method. For this purpose, the recording current is changed in steps during the recording of the video signal. After each change in the recording current for the video signal, a direct-voltage value is determined from the replay envelope curve of the audio signal as a measure of the replay amplitude of the audio signal. As soon as the direct-voltage value obtained from the replay envelope curve of the audio signal reaches a predetermined minimum value, the changing of the recording current for the recording of the video signal is ended and the last value of the recording current is stored for the following recording process. Recording systems in which video and audio signals are stored in tape layers of different depth. <IMAGE>
Patent EP-0317893-A3 (EP)
IPC: A61J3/06
Filed: 1988-11-17
Abstract: Durch das Verfahren und die Vorrichtung zum Überwachen und/oder Kontrollieren 
und/oder Registrieren und/oder Anzeigen der Einnahme von pharmazeutischen Präparaten, sollen präzise Informationen gewonnen 
werden, ob Präparate tatsächlich von Patienten eingenommen werden oder nicht.  
     Da den applizierten Präparaten jeweils 
wenigstens ein magnetischer Werkstoff zugesetzt ist, der auf ein von einer elektronischen Überwachungsvorrichtung erzeugtes, 
äußeres Magnetfeld reagierfähig ist, und der GI-Trakt des Patienten innerhalb mindestens eines vorgegebenen Zeitintervalles 
diesem Magnetfeld ausgesetzt wird, werden selektiv detektierbare Signale mit dem erwünschten Informationsinhalt erzeugt. 
Zusätzlich ist der Zeitpunkt der Arzneimittelentnahme aus der Verpackung ermittelbar und/oder eine 
Anwesenheits-/Identitätskontrolle des Patienten im Detektionsbereich möglich.  
     Eine bevorzugte Vorrichtung weist Mittel 
(46) zum Erfassen des Entnahmezeitpunktes des Präparats aus der Verpackung auf, Mittel (4 zur Arzneimitteleinnahmekontrolle 
mittels Magnetfeldes, Mittel (49) zur    Anwesenheits-/Identitätskontrolle sowie eine Kontroll- und Steuereinheit 
(50) zum Registrieren/Anzeigen der von den Mitteln (46, 4 49) gelieferten Ausgangssignale.
Patent EP-0295754-A3 (EP)
Title: Surface technique that accelerates the mass grinding and polishing of metal articles in roto finish equipment
IPC: C23F3/06
Filed: 1988-06-16
Abstract: Process for grinding and/or polishing metal articles in roto-finish equipment, in which (a) an adjusted quantity of said articles, which have a metal surface roughness that is higher than required for the finish, usually larger than 5 in AA (i.e. arithmic average); are introduced to a rotofinish apparatus and rotated for some time with (b) an adequate quantity of chips suitable for grinding and/or polishing the metal articles to be treated and (c) a compound that promotes grinding and/or polishing comprising one or more organic acids, wherein the compound is an organic acid or mixture of organic acids or solutions of organic acids in a concentration suitable for grinding and/or polishing the metal articles, and in that the grinding environment also comprises a finely divided metal or alloy with an oxidation potential greater than zero.
Patent EP-0286395-A3 (EP)
Title: Improved duckboard
IPC: E01C9/08
Filed: 1988-04-07
Abstract: A duckboard comprising a succession of treads (11) linked so as to rest, in use, in generally parallel non-co-axial corresponding-end-alignment along the ground or other surface on which the board is placed: and characterized by the features, firstly that the board is flexible enough to be rolled end-to-end; secondly, that it is light enough to be relatively portable; and thirdly, that the means (12) linking the treads (11) are resilient enough and/or rigid enough to tend to maintain the parallelism and the end-alignment of the treads (11) in use.
Patent EP-0295101-A3 (EP)
IPC: C12Q1/26
Filed: 1988-06-09
Abstract: A bilirubin oxidase having a substrate specificity 
to bilirubin but not to, at least, biliverdin, catechol and 
hemin and capable of catalyzing the reaction of two moles of 
bilirubin with one mole of oxygen to form two 
moles of biliverdin and two moles of water.
Patent EP-0316148-A3 (EP)
Title: Processor for radar system
IPC: G01S13/90
Filed: 1988-11-09
Abstract: In a synthetic aperture radar system the radar pulse 
echo return signals are sampled, which samples are 
correlated with a replica of the original signal to 
produce range line samples with increased resolution in 
the range direction. To increase resolution in the 
azimuth direction, a series of range lines are correlated 
or combined in some other way with Doppler or other 
reference coefficients.  
     A problem with this is that there is relative 
movement between any particular point on the ground and 
the radar system, and the samples in the range lines 
corresponding to that position lie on a slant line such as 
103 (skew axis y). To utilise the incoming data, the 
skew axis is arranged in a saw-tooth form. To facilitat 
processing data is fed into an input sequence of data 
storage location in for example a buffer 51, at a variable 
starting position which moves corresponding to each 
discontinuity in the zig-zag, so that the discontinuities 
are transparent to the processor. In one embodiment, 
azimuth processing can take place along columns in bands 
83 in a two-dimensional memory 53 corresponding to swaths 
on the ground 101.
Patent EP-0296978-A3 (EP)
Title: 1-benzyl 2-oxo 5-alkoxy pyrrolidine derivatives, process for their preparation, compositions containing them and their use in medicines
IPC: C07D207/273
Filed: 1988-06-23
Abstract: Compounds useful in the treatment of patients suffering from intellectual or nervous asthenias, memory failures, senescence or metal strain of the formula (I)    <IMAGE>  (I)  in which R' represents hydrogen, linear, branched or cyclic alkyl containing up to 12 carbon atoms, alkenyl containing from 2 to 8 carbon atoms, acyl containing from 1 to 6 carbon atoms or aralkyl containing from 7 to 15 carbon atoms and R represents aryl containing up to 14 carbon atoms, possibly substituted, or a mono- or polycyclic heterocyclic aromatic radical possibly substituted, provided that if R is unsubstituted phenyl, R' does not represent methyl or ethyl; also therapeutic compositions containing those compounds and method of use.
Patent EP-0288398-A3 (EP)
IPC: C08L67/00
Filed: 1988-04-20
Abstract: A reinforced polyester of improved strength 
comprising a multiple polyester having incorporated 
therein 0.1% to 10.0% by weight of a nucleating 
agent; 10% to 60% by weight of a reinforcing filler; 
and 0.5% to 5.0% by weight of a phenoxy resin having 
the formula 
  
wherein n is 50 to 100. A preferred filler is glass 
fibers, but the polyester may contain mica or talcum 
as well. The composition may also contain other 
additives such as flame retardants, stabilizers, 
plasticizers, processing aids and colorants. 
Preferred nucleating agents are partially neutralized 
alkali metal salts of ionic (C₂-C₅) 
alpha-olefin/(C₃-C₅) alpha-beta-ethylenically 
unsaturated carboxylic acid copolymers and mixtures 
thereof. The reinforced polyesters of the invention 
are used to manufacture articles by molding, 
preferably injection molding, useful in the 
automotive and electronic industry.
Patent EP-0324482-A3 (EP)
Title: Process of forming reflection holograms in photopolymerizable layers
IPC: G03F7/027
Filed: 1989-01-12
Abstract: An improved process is disclosed for the preparation of reflection holograms in said photopolymerizable layers. The reflection hologram may be enhanced by treatment with certain enhancing agents, or by heat treatment.