DE935496C - Process for the production of protein threads - Google Patents
Process for the production of protein threadsInfo
- Publication number
- DE935496C DE935496C DEC8942A DEC0008942A DE935496C DE 935496 C DE935496 C DE 935496C DE C8942 A DEC8942 A DE C8942A DE C0008942 A DEC0008942 A DE C0008942A DE 935496 C DE935496 C DE 935496C
- Authority
- DE
- Germany
- Prior art keywords
- threads
- esterification
- shaped sleeve
- protein
- production
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
- 238000000034 method Methods 0.000 title claims description 7
- 108090000623 proteins and genes Proteins 0.000 title claims description 7
- 102000004169 proteins and genes Human genes 0.000 title claims description 7
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 18
- 230000032050 esterification Effects 0.000 claims description 16
- 238000005886 esterification reaction Methods 0.000 claims description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000003054 catalyst Substances 0.000 claims description 3
- 235000019441 ethanol Nutrition 0.000 claims description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 9
- 239000005018 casein Substances 0.000 description 5
- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 description 5
- 235000021240 caseins Nutrition 0.000 description 5
- 235000018102 proteins Nutrition 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 235000013336 milk Nutrition 0.000 description 3
- 239000008267 milk Substances 0.000 description 3
- 210000004080 milk Anatomy 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 235000017060 Arachis glabrata Nutrition 0.000 description 1
- 244000105624 Arachis hypogaea Species 0.000 description 1
- 235000010777 Arachis hypogaea Nutrition 0.000 description 1
- 235000018262 Arachis monticola Nutrition 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 108010073771 Soybean Proteins Proteins 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 235000020232 peanut Nutrition 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- ZVCDLGYNFYZZOK-UHFFFAOYSA-M sodium cyanate Chemical compound [Na]OC#N ZVCDLGYNFYZZOK-UHFFFAOYSA-M 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 235000019710 soybean protein Nutrition 0.000 description 1
- 230000002522 swelling effect Effects 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F4/00—Monocomponent artificial filaments or the like of proteins; Manufacture thereof
- D01F4/04—Monocomponent artificial filaments or the like of proteins; Manufacture thereof from casein
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
- D01D10/04—Supporting filaments or the like during their treatment
- D01D10/0436—Supporting filaments or the like during their treatment while in continuous movement
- D01D10/0481—Supporting filaments or the like during their treatment while in continuous movement the filaments passing through a tube
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F11/00—Chemical after-treatment of artificial filaments or the like during manufacture
- D01F11/02—Chemical after-treatment of artificial filaments or the like during manufacture of cellulose, cellulose derivatives, or proteins
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/51—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with sulfur, selenium, tellurium, polonium or compounds thereof
- D06M11/55—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with sulfur, selenium, tellurium, polonium or compounds thereof with sulfur trioxide; with sulfuric acid or thiosulfuric acid or their salts
- D06M11/56—Sulfates or thiosulfates other than of elements of Groups 3 or 13 of the Periodic Table
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/58—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with nitrogen or compounds thereof, e.g. with nitrides
- D06M11/67—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with nitrogen or compounds thereof, e.g. with nitrides with cyanogen or compounds thereof, e.g. with cyanhydric acid, cyanic acid, isocyanic acid, thiocyanic acid, isothiocyanic acid or their salts, or with cyanamides; with carbamic acid or its salts
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
- D06M13/12—Aldehydes; Ketones
- D06M13/127—Mono-aldehydes, e.g. formaldehyde; Monoketones
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
- D06M13/144—Alcohols; Metal alcoholates
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/02—Natural fibres, other than mineral fibres
- D06M2101/10—Animal fibres
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Description
AUSGEGEBEN AM 24. NOVEMBER 1955ISSUED NOVEMBER 24, 1955
C 894.2IVc j29hC 894.2IVc j29h
Zusatz zum Patent 898Addendum to patent 898
Die Erfindung bezieht sich auf die Herstellung künstlicher Gebilde, wie Fäden, Fasern oder Bänder, welche im folgenden kurz als Fäden bezeichnet werden, aus Casein tierischen oder pflanzlichen Ursprungs, z. B. Milchcasein, Erdnußprotein, Sojabohnenprotein, Protein des gemeinen Wunderbaums und ähnlichen fadenbildenden Proteinen.The invention relates to the production of artificial structures, such as threads, fibers or ribbons, which in the following are briefly referred to as threads, made of animal or vegetable casein Origin, e.g. B. milk casein, peanut protein, soybean protein, protein of the common wonder tree and similar thread-forming proteins.
In der deutschen Patentschrift 898 658, ist ein Verfahren zur Herstellung von Proteinfäden mit verbesserter Widerstandsfähigkeit gegen Feuchtigkeit beschrieben, welche durch Härten der frisch gefällten Proteinfäden in einem Bad erhalten werden, das Formaldehyd und ein oder mehrere Metallsalze enthält, in welchem sie so lange behandelt werden, bis sie gegen die Löse- oder Quellwirkung von kaltem Wasser widerstandsfähig werden, worauf die Behandlung der gehärteten Fäden in einem Bad erfolgt, welches Methylalkohol oder Äthylalkohol zusammen mit einem Veresterungskatalysator, wie Schwefelsäure, enthält, um die Veresterung der Fäden zu erreichen und dann die veresterten Fäden einer Behandlung unterworfen werden, welche entweder aus einer weiteren Härtungsbehandlung in einem Bad besteht, das Formaldehyd und ein oder mehrere Metallsalze enthält, oder einer Behandlung zumIn the German patent specification 898 658, is a Process for the production of protein threads with improved resistance to moisture described, which are obtained by hardening the freshly precipitated protein threads in a bath that contains formaldehyde and one or more metal salts in which they are treated for so long until they are resistant to the dissolving or swelling effects of cold water whereupon the hardened threads are treated in a bath containing methyl alcohol or contains ethyl alcohol together with an esterification catalyst such as sulfuric acid, to achieve the esterification of the threads and then the esterified threads of a treatment subjected, which either consists of a further hardening treatment in a bath, which contains formaldehyde and one or more metal salts, or a treatment for
Unlöslichmachen. Die Veresterung nach dieser Patentschrift geschieht durch Eintauchen der gehärteten -Fäden in ein Veresterungsbad.Insolubilize. The esterification according to this patent is done by immersing the hardened - threads in an esterification bath.
Nach der Erfindung wird die in der Patentschrift 898 658 festgestellte Veresterungsstufe ausgeführt, indem die Fäden ununterbrochen durch ein Bad geführt werden, welches Methylalkohol oder Äthylalkohol und den Veresterungskatalysator enthält, die Fäden zur Entfernung der überschüssigen Flüssigkeit abgepreßt und dann der imprägnierte Faden in Windungen in eine J-förmige Hülse geführt wird, in welcher er während des Veresterungsvorganges verbleibt. Nach dem Abziehen des Fadens aus der J-förmigen Hülse kann er unmittelbar entweder zu einem weiteren Härtungsbad oder zur Behandlung auf Unlöslichkeit geführt werden. Zur Ausführung des Verfahrens nach der Erfindung ist es vorteilhaft, die Windungen des Kaböls in der J-förmigen Hülse auf einem Förderband zu tragen, das entweder kontinuierlich oder von Zeit zu Zeit von dem Eingangsende zu dem Ausgangsende der J-förmigen Hülse weiterbewegt wird. Die Anwendung einer Fördervorrichtung dieser Art trägt dazu bei, zu starken Druck an den angesammelten Windungen, besonders an der Krümmung der J-förmigen Hülse, zu vermeiden.According to the invention, the esterification stage identified in patent specification 898 658 is carried out, by continuously passing the threads through a bath containing methyl alcohol or Contains ethyl alcohol and the esterification catalyst, the threads to remove the excess Squeezed out liquid and then guided the impregnated thread in turns into a J-shaped sleeve in which it remains during the esterification process. After peeling off the The thread from the J-shaped sleeve can either be sent directly to another hardening bath or led to treatment for insolubility. To carry out the method according to the invention it is beneficial to use the turns of the kaböl in the J-shaped sleeve to be carried on a conveyor belt, either continuously or by time at time is advanced from the entrance end to the exit end of the J-shaped sleeve. the Application of a conveyor of this type helps to apply excessive pressure to the accumulated Avoid twists, especially at the curve of the J-shaped sleeve.
Das für das Förderband benutzte Material soll aus säurefestem Material bestehen, z. B. dem festen Polymer von Äthylen.The material used for the conveyor belt should consist of acid-proof material, e.g. B. the solid Polymer of ethylene.
Ein Beispiel einer geeigneten Vorrichtung zur Verwendung bei der Erfindung ist in der Zeichnung als senkrechter Querschnitt durch die J-förmige Hülse dargestellt. Ein Kabel aus Caseinfäden 1 wird nach Durchführen durch eine Veresterungsflüssigkeit und Abquetschiwalizen in Windungen 2 in eine J-förmige Hülse 3 geführt, in welcher ein Teil eines fortlaufenden Bandes 4, vorzugsweise aus Polyäthylenfäden, an beweglichen Walzen aufgehängt ist. Das Band 4 läuft über Führungswalzen 5, 6 und 7 und wird in gewissen Zeitabständen durch Druckwalzen 8 weiterbewegt. J-förmige Hülsen wurden bereits seit vielen Jahren zur Behandlung von Gewebe in Seilform, besonders zum Bleichen, angewendet (vgl. z. B. die britischen Patentschriften 744/1908 und 201 864 und auch die Zeitschrift American Dyestuff Reporter vom 30. April 19-51, S. 286 bis 292). Bei der Ausführung der Veresterung von Proteinfäden nach dem Patentanspruch des deutschen Patents 898 658 wurde gefunden, daß nur eine geringe Menge von Veresterungsflüssigkeit notwendig ist, um die gewünschte Veresterung zu erreichen.An example of a suitable device for use in the invention is shown in the drawing as a vertical cross-section through the J-shaped Sleeve shown. A cord made of casein threads 1 is after passing through an esterification liquid and Abquetschiwalizen guided in turns 2 in a J-shaped sleeve 3, in which part of a continuous belt 4, preferably made of polyethylene threads, on movable Rolling is suspended. The belt 4 runs over guide rollers 5, 6 and 7 and is in certain Moved on at intervals by pressure rollers 8. J-shaped sleeves have been around for many Years of use for the treatment of fabric in rope form, especially for bleaching (see e.g. the British patents 744/1908 and 201 864 and also the American Dyestuff Reporter, April 30, 19-51, pp. 286-292). In the Execution of the esterification of protein threads according to the claim of the German patent 898 658 it was found that only a small amount of esterification liquid is necessary, to achieve the desired esterification.
Ein fortlaufendes Kabel von Milchcaseinfäden von 140 000 den wurde, nachdem es 2 Stunden in einem Bad bei 15° gehärtet war, das je Liter 400 g Natriumsulfat und 10 g Formaldehyd enthielt, von Salz und Formaldehyd freigewascheti, indem man es über Walzen führte, deren unterer Teil mit einem vierten Teil ihrer Länge in fließendem Wasser drehte. Das gewaschene Kabel wurde dann abgequetscht, durch ein Bad von Methylalkohol geführt, nochmals abgequetscht und dann durch ein zweites Bad geführt, welches je Liter 500 g Schwefelsäure, 240 g Wasser und 460 g Methylalkohol enthielt. Die überschüssige Flüssigkeit wurde dann vom Kabel abgequetscht und dieses dann in eine J-förmige Hülse in Windungen geführt, welche 90 Minuten bei 25 ° in ihr verblieben. Das Kabel wurde dann kontinuierlich von dem anderen Ende der J-förmigen Hülse abgeführt, auf Zickzack-Walzen mit Wasser gewaschen, mit Natriumcyanat unlöslich gemacht, wie in Beispiel 8 der Patentschrift 898 658 angegeben, in Stapellänge geschnitten und getrocknet.A continuous cord of milk casein of 140,000 den was made after it had been in for 2 hours a bath was cured at 15 °, which contained 400 g of sodium sulfate and 10 g of formaldehyde per liter, of Salt and formaldehyde-free by washing it led over rollers, the lower part of which with a fourth part of their length in flowing Water turned. The washed cable was then squeezed off, passed through a bath of methyl alcohol, squeezed again and then passed through a second bath, which per liter 500 g Sulfuric acid, 240 g water and 460 g methyl alcohol contained. The excess liquid was then squeezed off the cable and this then wound into a J-shaped sleeve, which remained in it for 90 minutes at 25 °. The cable was then continuously fed up from the other end of the J-shaped sleeve Zigzag rollers washed with water, insolubilized with sodium cyanate, as in example 8 of patent specification 898 658 indicated, cut into pile length and dried.
Die erhaltenen Fäden hatten eine geringe Ansaugfähigkeit von 1% für wäßrige Natriumcarbönatlösung und sie waren sehr widerstandsfähig gegen die Einwirkung von kochender verdünnter Säure.The threads obtained had a low absorbency of 1% for aqueous sodium carbonate solution and they were very resistant to the action of boiling dilute Acid.
B eisp i el 2Example 2
Ein fortlaufendes Kabel von gehärteten Milchcaseinfäden wurde mit einer Veresterungsflüssig- keit imprägniert, welche je Liter 450 g Schwefelsäure, 500 g· Methylalkohol und 250 g Wasser enthielt. Es wurde durch Ausquetschwalzen und in eine J-förmige Hülse geführt, in welcher .sich ein Polyäthylenband, wie in der Zeichnung dargestellt, befand. Das Förderband wurde von Zeit zu Zeit weiterbewegt und das Kabel nach zweistündigem Verweilen in der J-förmigen Hülse kontinuierlich abgezogen. Die Temperatur in der Hülse war 250.A continuous tow of hardened milk casein threads was impregnated with an esterification liquid which contained 450 g sulfuric acid, 500 g methyl alcohol and 250 g water per liter. It was passed through squeeze rollers and into a J-shaped sleeve in which a polyethylene tape, as shown in the drawing, was. The conveyor belt was moved from time to time and the cable was continuously pulled off after it had been in the J-shaped sleeve for two hours. The temperature in the sleeve was 25 0 .
Claims (2)
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1088950A GB690492A (en) | 1950-12-13 | 1950-05-03 | Improvements in and relating to the production of artificial filaments, threads, fibres, bands and the like |
| GB3042850A GB701645A (en) | 1950-05-03 | 1950-12-13 | Improvements in the manufacture and production of artificial filaments, threads, bands and the like |
| GB6115/53A GB741740A (en) | 1950-05-03 | 1953-03-05 | Improvements in and relating to the production of artificial filaments, threads, fibres, bands and the like |
| GB613055A GB778257A (en) | 1955-03-02 | 1955-03-02 | Improvements in the manufacture and production of artificial filaments, threads, bands and the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE935496C true DE935496C (en) | 1955-11-24 |
Family
ID=42289807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEC8942A Expired DE935496C (en) | 1950-05-03 | 1954-02-26 | Process for the production of protein threads |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE935496C (en) |
-
1954
- 1954-02-26 DE DEC8942A patent/DE935496C/en not_active Expired
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