US1997375A - Method to frost the inner surface of a glass bulb for electric lamps - Google Patents

Method to frost the inner surface of a glass bulb for electric lamps Download PDF

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Publication number
US1997375A
US1997375A US661959A US66195933A US1997375A US 1997375 A US1997375 A US 1997375A US 661959 A US661959 A US 661959A US 66195933 A US66195933 A US 66195933A US 1997375 A US1997375 A US 1997375A
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bulb
frost
powder
glass bulb
electric lamps
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US661959A
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Naruse Tomisaburo
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C15/00—Surface treatment of glass, not in the form of fibres or filaments, by etching

Definitions

  • This invention relates to a method to frost the inner surface of a glass bulb for electric lamp, characterized by the fact that first injecting and then extracting in the bulb through a narrow tube a corrosive liquid containing some powder having a lower specific gravity than that of any of the other elements of the corrosive liquid.
  • the purpose of this invention is to obtain the beautiful electric lamp bulbs having a uniformly frosted surface and having the gradually lessened frosted edge, instead of a sharp clear edge.
  • Fig. 1 shows the state of the corroding liquid in the bulb, when the injecting action is finished.
  • Fig. 2 shows the frosted inner surface
  • the glass bulb (a) is placed with the opening uppermost and through a narrow tube (b) is first injected into the bulb, the corroding liquid containing some powder, for example parafiin powder, wooden powder etc., having a lower specific gravity than that of any other element of the corroding liquid.
  • the corroding mixture is subsequently extracted from the bulb.
  • the powder in the bulb floats up from the bottom of the bulb, and this floating motion of the powder mixes it with the liquid in the bulb.
  • the well mixed powder and liquid frosts the bulb uniformily, as shown in Fig. 2 (f)
  • the surface of the liquid is covered with the accumulation of powder to some depth. The corroding action is lessened on the glass surface by said powder accumulation.
  • edge line of the frosted surface is not sharp, but the degree of frosting is gradually lessened upwards as at (e).
  • a method to frost the inner surface of'a glass bulb for electric lamp consisting of first injecting into the. bulb a corrosive liquid containing an admixture of powder having a lower specific gravity than that of any of the other elements of the corrosive liquid and finally extracting said liquid from the bulb.
  • a method according to claim 1 in which said corrosive liquid comprises 38% hydrogen fluoride 38% ammonium fluoride, sulphuric acid and 15% water, all approximate proportions.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)

Description

April 9, 1935. 1-; NAIQQUSE 1,997,315,
METHOD TO FROST THE INNER SURFACE OF A GLASS BULB FOR ELECTRIC LAMPS Filed March 21, 1933 1 INVENTOR.' 77% 3a.
, BYf S 7% g q;
A TTORNEYS.
Patented Apr. 9, 1935 UNITED STATES METHOD TO FROST THE INNER SURFACE OF A GLASS BULB FOR ELECTRIC LAMPS Tomisaburo Naruse, Uchiyamashita-Oho,
Kojimachi-Ku, Tokyo, Japan Application March 21,
4 Claims.
This invention relates to a method to frost the inner surface of a glass bulb for electric lamp, characterized by the fact that first injecting and then extracting in the bulb through a narrow tube a corrosive liquid containing some powder having a lower specific gravity than that of any of the other elements of the corrosive liquid.
The purpose of this invention is to obtain the beautiful electric lamp bulbs having a uniformly frosted surface and having the gradually lessened frosted edge, instead of a sharp clear edge.
The accompanying drawing illustrates the method of the present invention.
Fig. 1 shows the state of the corroding liquid in the bulb, when the injecting action is finished.
Fig. 2 shows the frosted inner surface.
The glass bulb (a) is placed with the opening uppermost and through a narrow tube (b) is first injected into the bulb, the corroding liquid containing some powder, for example parafiin powder, wooden powder etc., having a lower specific gravity than that of any other element of the corroding liquid. The corroding mixture is subsequently extracted from the bulb.
In order that the invention may be fully un :ierstood, one practical example is given below:
Percent Hydrogen fluoride 38 Ammonium fluoride 38 Sulphuric aci 5 Water 15 1933, Serial No. 661,959
able apparatus, 50 both the powder and the liquid areinjected in the bulb also.
The powder in the bulb floats up from the bottom of the bulb, and this floating motion of the powder mixes it with the liquid in the bulb. Thus, the well mixed powder and liquid frosts the bulb uniformily, as shown in Fig. 2 (f) Then, when the'fioating motion of the greater part of the powder is finished, the surface of the liquid is covered with the accumulation of powder to some depth. The corroding action is lessened on the glass surface by said powder accumulation.
Thus, the edge line of the frosted surface is not sharp, but the degree of frosting is gradually lessened upwards as at (e).
Thus, beautiful electric lamp bulbs are obtained by this method.
I claim:
1. A method to frost the inner surface of'a glass bulb for electric lamp, consisting of first injecting into the. bulb a corrosive liquid containing an admixture of powder having a lower specific gravity than that of any of the other elements of the corrosive liquid and finally extracting said liquid from the bulb.
2. A method according to claim 1, in which said admixture consists of wood powder.
3. A method according to claim 1 in which said corrosive liquid comprises 38% hydrogen fluoride 38% ammonium fluoride, sulphuric acid and 15% water, all approximate proportions.
4. A method according to claim 1 in which said TOMISABURO NARUSE.
US661959A 1933-03-21 1933-03-21 Method to frost the inner surface of a glass bulb for electric lamps Expired - Lifetime US1997375A (en)

Priority Applications (1)

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US661959A US1997375A (en) 1933-03-21 1933-03-21 Method to frost the inner surface of a glass bulb for electric lamps

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US661959A US1997375A (en) 1933-03-21 1933-03-21 Method to frost the inner surface of a glass bulb for electric lamps

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US1997375A true US1997375A (en) 1935-04-09

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE743907C (en) * 1937-01-09 1944-01-05 Oesterreichische Glasfabriken Process for the production of glass objects that diffusely scatter the light, in particular incandescent lamp bulbs, cover bells, lighting glasses and the like. like
US2486431A (en) * 1944-08-18 1949-11-01 Rca Corp Method of producing low-glare coatings
US2529703A (en) * 1943-05-28 1950-11-14 Rca Corp Production of low reflectance skeletonized surface on glass
US3058866A (en) * 1958-08-27 1962-10-16 Luma Lampan Aktiebolag Method of producing a light-diffusing layer on glass surfaces, especially on the inside of electric lamp envelopes
US3158517A (en) * 1959-11-05 1964-11-24 Telefunken Gmbh Process for forming recesses in semiconductor bodies
US5196088A (en) * 1988-08-05 1993-03-23 Tru Vue, Inc. Process and apparatus for producing non-glare glass by etching

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE743907C (en) * 1937-01-09 1944-01-05 Oesterreichische Glasfabriken Process for the production of glass objects that diffusely scatter the light, in particular incandescent lamp bulbs, cover bells, lighting glasses and the like. like
US2529703A (en) * 1943-05-28 1950-11-14 Rca Corp Production of low reflectance skeletonized surface on glass
US2486431A (en) * 1944-08-18 1949-11-01 Rca Corp Method of producing low-glare coatings
US3058866A (en) * 1958-08-27 1962-10-16 Luma Lampan Aktiebolag Method of producing a light-diffusing layer on glass surfaces, especially on the inside of electric lamp envelopes
US3158517A (en) * 1959-11-05 1964-11-24 Telefunken Gmbh Process for forming recesses in semiconductor bodies
US5196088A (en) * 1988-08-05 1993-03-23 Tru Vue, Inc. Process and apparatus for producing non-glare glass by etching

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