Method of fabricating heat mirror for incandescent lamp envelope

Claim 1

The method of applying a heat mirror which is transmissive for visible radiations and reflective for infrared radiations to the interior surface of a regularly conformed hollow thin-walled vitreous light-transmitting member intended for use as an envelope for an incandescent light source, which method comprises: a. applying to the interior surface of said envelope, to a substantially uniform predetermined thickness, a clear solution having contained therein partially hydrolyzed metallic alkoxide which in the metallic alkoxide form prior to hydrolyzation is expressed as M(OR) n , wherein M at least substantially comprises titanium, R is alkyl with from 1 to 6 carbon atoms, and n is the valence of M; total reacted and unreacted water in said solution being present in amount of from 0.6 mole to 8 moles per mole of said metallic alkoxide; the solution solvent being liquid aliphatic alcohol present in amount to provide a solution solids content, expressed as equivalent metallic oxide, of from about 0.1% to about 3% by weight; and as an optional constituent, said solution is acidified with at least one of hydrochloric, nitric and perchloric acid in amount of up to about 0.3 mole per mole of said metallic alkoxide; b. heating said envelope and first applied solution to a temperature of from about 300° C. to about 600° C. but not exceeding the strain point of said envelope for a sufficient period of time to convert said applied clear solution to an adherent thin continuous metallic oxide layer; c. applying over said first applied metallic oxide layer a thin continuous silver layer of predetermined thickness sufficient to be substantially transmissive for visible radiations and substantially reflective for infrared radiations; d. applying over the applied silver layer to a thin substantially uniform predetermined thickness a second clear solution as used to apply said first-applied metallic oxide layer; and e. heating said envelope and applied second clear solution to a temperature of from about 300° C. to about 425° C. under conditions which are non-reactive for silver for a sufficient period of time to convert said second applied clear solution to an adherent clear metallic oxide layer.

Claim 2

The method of applying a heat mirror which is transmissive for visible radiations and reflective for infrared radiations to the interior surface of a regularly conformed hollow thin-walled vitreous light-transmitting member intended for use as an envelope for an incandescent light source, which method comprises: a. applying to the interior surface of said envelope, to a substantially uniform predetermined thickness, a clear solution having contained therein partially hydrolyzed metallic alkoxide which in the metallic alkoxide form prior to hydrolyzation is expressed as M(OR) n , wherein M at least substantially comprises titanium, R is alkyl with from 1 to 6 carbon atoms, and n is the valence of M; total reacted and unreacted water in said solution being present in amount of from 0.6 mole to 8 moles per mole of said metallic alkoxide; the solution solvent being liquid aliphatic alcohol present in amount to provide a solution solids content, expressed as equivalent metallic oxide, of from about 0.1% to about 3% by weight; and as an optional constituent, said solution is acidified with at least one of hydrochloric, nitric and perchloric acid in amount of up to about 0.3 mole per mole of said metallic alkoxide; b. heating said envelope and first applied solution to a temperature of from about 300° C. to about 600° C. but not exceeding the strain point of said envelope for a sufficient period of time to convert said applied clear solution to an adherent thin continuous metallic oxide layer; c. applying over said first applied metallic oxide layer a thin continuous silver layer of predetermined thickness sufficient to be substantially transmissive for visible radiations and substantially reflective for infrared radiations; d. applying over the applied silver layer to a thin substantially uniform predetermined thickness a second clear solution as used to apply said first-applied metallic oxide layer; and e. heating said envelope and applied second clear solution to a temperature of from about 300° C. to about 425° C. under conditions which are non-reactive for silver for a sufficient period of time to convert said second applied clear solution to an adherent clear metallic oxide layer.

Claim 3

The method of applying a heat mirror which is transmissive for visible radiations and reflective for infrared radiations to the interior surface of a regularly conformed hollow thin-walled vitreous light-transmitting member intended for use as an envelope for an incandescent light source, which method comprises: a. applying to the interior surface of said envelope, to a substantially uniform predetermined thickness, a clear solution having dissolved therein partially hydrolyzed titanium alkoxide which in the alkoxide form prior to hydrolyzation is expressed as Ti(OR) 4 , wherein R is alkyl with from 1 to 6 carbon atoms; total water in said solution is present in amount of from about 1.5 moles to about 2.5 moles per mole of said titanium alkoxide; the solution solvent being liquid aliphatic alcohol present in amount to provide a solution solids content, expressed as equivalent titanium oxide, of from about 1% to about 2% by weight; and said solution is acidified with at least one of hydrochloric, nitric and perchloric acid in amount of from about 0.02 to about 0.03 mole per mole of titanium alkoxide; b. heating said envelope and first applied solution to a temperature of from about 325° C. to about 550° C. but not exceeding the strain point of said envelope for a sufficient period of time to convert said applied clear solution to an adherent thin continuous titanium oxide layer; c. vacuum metalizing over said first applied titanium oxide layer a thin continuous silver layer of predetermined thickness sufficient to be substantially transmissive for visible radiations and substantially reflective for infrared radiations; d. applying over the applied silver layer to a thin substantially uniform predetermined thickness a second clear solution as used to apply said first-applied titanium oxide layer; and e. heating said envelope and applied second clear solution to a temperature of from about 325° C. to about 375° C. under conditions which are non-reactive for silver for a sufficient period of time to convert said second applied clear solution to an adherent clear titanium oxide layer.

Claim 4

The method of applying a heat mirror which is transmissive for visible radiations and reflective for infrared radiations to the interior surface of a regularly conformed hollow thin-walled vitreous light-transmitting member intended for use as an envelope for an incandescent light source, which method comprises: a. applying to the interior surface of said envelope, to a substantially uniform predetermined thickness, a clear solution having dissolved therein partially hydrolyzed titanium alkoxide which in the alkoxide form prior to hydrolyzation is expressed as Ti(OR) 4 , wherein R is alkyl with from 1 to 6 carbon atoms; total water in said solution is present in amount of from about 1.5 moles to about 2.5 moles per mole of said titanium alkoxide; the solution solvent being liquid aliphatic alcohol present in amount to provide a solution solids content, expressed as equivalent titanium oxide, of from about 1% to about 2% by weight; and said solution is acidified with at least one of hydrochloric, nitric and perchloric acid in amount of from about 0.02 to about 0.03 mole per mole of titanium alkoxide; b. heating said envelope and first applied solution to a temperature of from about 325° C. to about 550° C. but not exceeding the strain point of said envelope for a sufficient period of time to convert said applied clear solution to an adherent thin continuous titanium oxide layer; c. vacuum metalizing over said first applied titanium oxide layer a thin continuous silver layer of predetermined thickness sufficient to be substantially transmissive for visible radiations and substantially reflective for infrared radiations; d. applying over the applied silver layer to a thin substantially uniform predetermined thickness a second clear solution as used to apply said first-applied titanium oxide layer; and e. heating said envelope and applied second clear solution to a temperature of from about 325° C. to about 375° C. under conditions which are non-reactive for silver for a sufficient period of time to convert said second applied clear solution to an adherent clear titanium oxide layer.

Claim 7

The method of applying a heat mirror which is transmissive for visible radiations and reflective for infrared radiations to the interior surface of a regularly conformed hollow thin-walled vitreous light-transmitting member intended for use as an envelope for an incandescent light source, which method comprises: a. applying contiguous with the interior surface of said vitreous member a thin continuous silver layer of predetermined thickness sufficient to be substantially transmissive for visible radiations and substantially reflective for infrared radiations; b. applying over the applied silver layer to a substantially uniform predetermined thickness, a clear solution having contained therein partially hydrolyzed metallic alkoxide which in the metallic alkoxide form prior to hydrolyzation is expressed as M(OR) n , wherein M at least substantially comprises titanium, R is alkyl with from 1 to 6 carbon atoms, and n is the valence of M; total reacted and unreacted water in said solution being present in amount of from 0.6 mole to 8 moles per mole of said metallic alkoxide; the solution solvent being liquid aliphatic alcohol present in amount to provide a solution solids content, expressed as equivalent metallic oxide, of from about 0.1% to about 3% by weight; and as an optional constituent, said solution is acidified with at least one of hydrochloric, nitric and perchloric acid in amount of up to about 0.3 mole per mole of said metallic alkoxide; and c. heating said envelope and applied clear solution to a temperature of from about 300° C. to about 425° C. under conditions which are non-reactive for silver for a sufficient period of time to convert said second applied clear solution to an adherent clear metallic oxide layer.

Claim 8

The method of applying a heat mirror which is transmissive for visible radiations and reflective for infrared radiations to the interior surface of a regularly conformed hollow thin-walled vitreous light-transmitting member intended for use as an envelope for an incandescent light source, which method comprises: a. applying contiguous with the interior surface of said vitreous member a thin continuous silver layer of predetermined thickness sufficient to be substantially transmissive for visible radiations and substantially reflective for infrared radiations; b. applying over the applied silver layer to a substantially uniform predetermined thickness, a clear solution having contained therein partially hydrolyzed metallic alkoxide which in the metallic alkoxide form prior to hydrolyzation is expressed as M(OR) n , wherein M at least substantially comprises titanium, R is alkyl with from 1 to 6 carbon atoms, and n is the valence of M; total reacted and unreacted water in said solution being present in amount of from 0.6 mole to 8 moles per mole of said metallic alkoxide; the solution solvent being liquid aliphatic alcohol present in amount to provide a solution solids content, expressed as equivalent metallic oxide, of from about 0.1% to about 3% by weight; and as an optional constituent, said solution is acidified with at least one of hydrochloric, nitric and perchloric acid in amount of up to about 0.3 mole per mole of said metallic alkoxide; and c. heating said envelope and applied clear solution to a temperature of from about 300° C. to about 425° C. under conditions which are non-reactive for silver for a sufficient period of time to convert said second applied clear solution to an adherent clear metallic oxide layer.

Claim 9

The method of applying a heat mirror which transmissive for visible radiations and reflective for infrared radiations to the interior surface of a regularly conformed hollow thin-walled vitreous light-transmitting member intended for use as an envelope for an incandescent light source, which method comprises: a. applying onto the interior surface of said vitreous member a thin continuous silver layer of predetermined thickness sufficient to be substantially transmissive for visible radiations and substantially reflective for infrared radiations; b. applying over the applied silver layer to a substantially uniform predetermined thickness, a clear solution having dissolved therein partially hydrolyzed titanium alkoxide which in the alkoxide form prior to hydrolyzation is expressed as Ti(OR) 4 , wherein R is alkyl with from 1 to 6 carbon atoms; total water in said solution is present in amount of from about 1.5 moles to about 2.5 moles per mole of said titanium alkoxide; the solution solvent being liquid aliphatic alcohol present in amount to provide a solution solids content, expressed as equivalent titanium oxide, of from about 1% to about 2% by weight; and said solution is acidified with at least one of hydrochloric, nitric and perchloric acid in amount of from about 0.02 to about 0.03 mole per mole of titanium alkoxide; and c. heating said envelope and applied clear solution to a temperature of from about 325° C. to about 375° C. under conditions which are non-reactive for silver for a sufficient period of time to convert said second applied clear solution to an adherent clear titanium oxide layer.

Claim 10

The method of applying a heat mirror which transmissive for visible radiations and reflective for infrared radiations to the interior surface of a regularly conformed hollow thin-walled vitreous light-transmitting member intended for use as an envelope for an incandescent light source, which method comprises: a. applying onto the interior surface of said vitreous member a thin continuous silver layer of predetermined thickness sufficient to be substantially transmissive for visible radiations and substantially reflective for infrared radiations; b. applying over the applied silver layer to a substantially uniform predetermined thickness, a clear solution having dissolved therein partially hydrolyzed titanium alkoxide which in the alkoxide form prior to hydrolyzation is expressed as Ti(OR) 4 , wherein R is alkyl with from 1 to 6 carbon atoms; total water in said solution is present in amount of from about 1.5 moles to about 2.5 moles per mole of said titanium alkoxide; the solution solvent being liquid aliphatic alcohol present in amount to provide a solution solids content, expressed as equivalent titanium oxide, of from about 1% to about 2% by weight; and said solution is acidified with at least one of hydrochloric, nitric and perchloric acid in amount of from about 0.02 to about 0.03 mole per mole of titanium alkoxide; and c. heating said envelope and applied clear solution to a temperature of from about 325° C. to about 375° C. under conditions which are non-reactive for silver for a sufficient period of time to convert said second applied clear solution to an adherent clear titanium oxide layer.