Patent US3864194A successfully refreshed from Google Patents.
US3864194A
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Optical shielding element having low reflecting power and method for producing
Assignee: Nikon Corp
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Filing: 1973-11-21
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Granted: 1975-02-04
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Expires: 1993-11-21
Abstract
Abstract An optical shielding element having low reflecting power is produced by the process comprising the steeps of (1) depositing at least one heavy metal capable of forming monovalent ions upon oxidation such as silver, copper and thalium on a transparent glass containing a light metal such as sodium capable of ionexchanging with said heavy metal in the desired shielding pattern, (2) ion-penetrating said heavy metal of the thin film into said transparent glass by reductive condensation reaction to produce a completely light shielding portion in the transparent glass.
Inventors
- 👤 Takashi Shibata
- 👤 Teruo Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:47
CPC Classifications
C; C03; C03C; C03C21/00; C03C21/001; C03C21/005
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
24 words
A method according to claim 1, in which said light metal is selected from the alkali metal group consisting of sodium, potassium and lithium.
Claim 2
Dependent Claim
22 words
A method according tO claim 1, in which said heavy metal is selected from the group consisting of silver, copper and thallium.
Claim 3
Dependent Claim
38 words
A process according to claim 1 in which said light metal is selected from the alkali metal group consisting of sodium, potassium and lithium, said heavy metal is selected from the group consisting of silver, copper and thallium.
Claim 4
Independent Claim
110 words
A method for producing a light shielding element exhibiting low reflecting power with a desired form of a light shielding portion, which comprises the steps of a. depositing in a desired pattern on a surface of a transparent glass containing at least one light metal at least one heavy metal capable of ion-exchanging with the light metal and of forming monovalent ions upon oxidation, b. ion-exchanging ions of said light metal with ions of said heavy metal thereby to penetrate said heavy metal ions into said transparent glass, and c. subjecting the glass for between 5 and 30 minutes to areductive atmosphere at a temperature of between 300*C and 600*C.
Claim 5
Dependent Claim
38 words
A process according to claim 5 in which said light metal is selected from the alkali metal group consisting of sodium, potassium and lithium, said heavy metal is selected from the group consisting of silver, copper and thallium.
Claim 6
Dependent Claim
49 words
A method according to claim 1, in which said heavy metal is silver and the same is oxidized after deposition by heating same at a temperature of between 250*C and 450*C while a direct current is applied between the glass surfaces, the silver deposited surface being the positive electrode.
Claim 7
Dependent Claim
49 words
A method according to claim 5, in which said heavy metal is silver and the same is oxidized after deposition by heating same at a temperature of between 250*C and 450*C while a direct current is applied between the glass surfaces, the silver deposited surface being the positive electrode.
Claim 8
Dependent Claim
56 words
A method according to claim 1, in which said heavy metal is selected from the group consisting of copper and thallium and the same is oxidized after deposition by heating same to a temperature of between 300*C and 500*C while a direct current is applied between the glass surfaces, the deposited surface being the positive electrode.
Claim 9
Dependent Claim
56 words
A method according to claim 5, in which said heavy metal is selected from the group consisting of copper and thallium and the same is oxidized after deposition by heating same to a temperature of between 300*C and 500*C while a direct current is applied between the glass surfaces, the deposited surface being the positive electrode.
Claim 10
Dependent Claim
59 words
A light shielding element having low reflecting power with a desired light shielding pattern on a glass with comprises a. a transparent portion free of heavy metal ions, and b. an opaque portion containing colloidal particles produced by reduction and condensation of at least one heavy metal ions penetrated by exchange of light metal ions in a base glass.
Claim 11
Dependent Claim
28 words
A light shielding element according to claim 11, in which said heavy metal ion is selected from the group consisting of silver ion, copper ion and thallium ion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |