[go: up one dir, main page]

NL146820B - Werkwijze voor de zuivering van pyromellietzuurdianhydride. - Google Patents

Werkwijze voor de zuivering van pyromellietzuurdianhydride.

Info

Publication number
NL146820B
NL146820B NL666603485A NL146820DA NL146820B NL 146820 B NL146820 B NL 146820B NL 666603485 A NL666603485 A NL 666603485A NL 146820D A NL146820D A NL 146820DA NL 146820 B NL146820 B NL 146820B
Authority
NL
Netherlands
Prior art keywords
purification
acid dianhydride
pyromellitic acid
pyromellitic
dianhydride
Prior art date
Application number
NL666603485A
Other languages
English (en)
Original Assignee
Gelsenberg Benzin Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Publication of NL146820B publication Critical patent/NL146820B/nl

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/16—Amplitude modulation by means of discharge device having at least three electrodes
    • H03C1/18—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid
    • H03C1/22—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid modulating signal applied to same grid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J21/00—Vacuum tubes
    • H01J21/02—Tubes with a single discharge path
    • H01J21/06—Tubes with a single discharge path having electrostatic control means only
    • H01J21/065—Devices for short wave tubes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/54—Amplifiers using transit-time effect in tubes or semiconductor devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transmitters (AREA)
  • X-Ray Techniques (AREA)
NL666603485A 1947-09-10 Werkwijze voor de zuivering van pyromellietzuurdianhydride. NL146820B (nl)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB24839/47A GB629721A (en) 1947-09-10 1947-09-10 Modulating and amplifying arrangements for grounded grid amplifiers

Publications (1)

Publication Number Publication Date
NL146820B true NL146820B (nl)

Family

ID=10218056

Family Applications (1)

Application Number Title Priority Date Filing Date
NL666603485A NL146820B (nl) 1947-09-10 Werkwijze voor de zuivering van pyromellietzuurdianhydride.

Country Status (3)

Country Link
US (1) US2525491A (nl)
GB (1) GB629721A (nl)
NL (1) NL146820B (nl)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2642539A (en) * 1950-12-27 1953-06-16 Samuel W Lichtman Geiger tube circuit with cathode follower
US2924756A (en) * 1955-07-14 1960-02-09 Phillips Petroleum Co Indicating and control apparatus

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2216170A (en) * 1939-07-25 1940-10-01 Roscoe H George Ultra high frequency oscillator
US2408355A (en) * 1942-01-29 1946-09-24 Rca Corp Concentric line oscillator
US2462866A (en) * 1942-11-30 1949-03-01 Standard Telephones Cables Ltd High-frequency oscillator
US2485400A (en) * 1945-04-19 1949-10-18 Gen Electric High-frequency electron discharge apparatus

Also Published As

Publication number Publication date
US2525491A (en) 1950-10-10
GB629721A (en) 1949-09-27

Similar Documents

Publication Publication Date Title
NL69786C (nl) Werkwijze ter bereiding van....
NL139666B (nl) Werkwijze voor de bereiding van een isomeer van het 2-methyl-3-aminochroman en zuuradditiezouten daarvan.
DK70516C (da) Fremgangsmåde til fremstilling af formylfolinsyre.
NL72227C (nl) Werkwijze voor de bereiding van kleursterk beta-koperphtalocyanine
NL146820B (nl) Werkwijze voor de zuivering van pyromellietzuurdianhydride.
CH259947A (de) Verfahren zur Herstellung ferromagnetischer Körper.
CH309551A (de) Verfahren zur Herstellung halogenierter aromatischer Kohlenwasserstoffe.
NL153851B (nl) Werkwijze voor de bereiding van methacrylzuur uit alfa-hydroxyisoboterzuur.
CH275797A (de) Verfahren zur Herstellung von Nitropolystyrol.
NL158781B (nl) Werkwijze voor de bereiding van gamma-chlooracetylazijnzuuresters.
CH276716A (de) Verfahren zur Herstellung von Phthalsäureanhydrid.
NL147128B (nl) Werkwijze voor de bereiding van polychloorbenzoezuren.
CH266637A (de) Verfahren zur Zerlegung von d1-Methionin.
CH250216A (de) Verfahren zur Herstellung von für die Behandlung von Schleimhäuten geeigneten Salben.
CH277650A (de) Verfahren und Apparatur zur Herstellung von Salpetersäure.
DK68837C (da) Fremgangsmåde til fremstilling af folinsyre.
FI25580A (fi) Menetelmä p-aminobentsolisulfoniamidopyrimidiinien valmistamiseksi
NL141496B (nl) Werkwijze voor de bereiding van adipinezuur.
CH260798A (it) Procedimento per la fabbricazione di dicloro-difenil-tricloroetano.
AT168625B (de) Verfahren zur Herstellung von Folsäure
AT194067B (de) Verfahren zur Herstellung von antiseptischen Salben
NL140240B (nl) Werkwijze ter bereiding van halogeniden van de lysergzuur- en dihydrolysergzuurreeks.
DK72943C (da) Fremgangsmåde til fremstilling af γ-metylmerkapto-α-aminosmørsyre.
DK77379C (da) Fremgangsmåde til fremstilling af pyromellitsyre.
CH246257A (de) Verfahren zur Herstellung von p-Oxy-phenyl-arsinsäure.