US4514456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a coded marking in a glass workpiece employing a trisilicate coating and product thereof
Assignee: RCA Licensing Corp
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Filing: 1982-09-20
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Granted: 1985-04-30
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Expires: 2002-09-20
Abstract
Abstract An undercoating is deposited on a glass workpiece and an overcoating is applied upon the undercoating. Then a plurality of related marks is recessed through the overcoating, thereby producing the novel workpiece. Each of the undercoating and overcoating is comprised of pigment particles and an alkali silicate binder. The alkali silicate binder of at least one coating, and preferably both the undercoating and the overcoating, consists essentially of a mixture of sodium silicate, potassium silicate and lithium silicate. The coatings are made from aqueous suspensions of pigment particles, dissolved sodium silicate, dissolved potassium silicate and lithium-stabilized silica sol.
Inventors
- 👤 Samuel B. Deal
- 👤 Barry M. Cushman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:39
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/34; C03C17/3411; G; G06; G06K; G06K1/00; G06K1/12; C03C2217/00; C03C2217/40; C03C2217/43; C03C2217/44; C03C2217/45; C03C2217/46; C03C2217/48; C03C2217/485; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24851; Y10T428/24868; Y10T428/24876; Y10T428/24893; Y10T428/24909; Y10T428/24926; Y10T428/24942
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
119 words
In a method for producing a machine-readable coded marking in a surface of a glass workpiece, said method including (a) applying to a selected surface area of said glass workpiece an undercoating comprising a first aqueous suspension consisting essentially of first pigment particles and a first alkali silicate binder, (b) drying said undercoating, (c) applying to said dry undercoating an overcoating comprising a second aqueous suspension of second pigment particles and a second alkali silicate binder, (d) drying said overcoating and (e) recessing a plurality of related marks through said overcoating, the improvement wherein at least one of said alkali silicate binders consists essentially of a mixture of dissolved sodium silicate, dissolved potassium silicate, and a lithium-stabilized silica sol.
Claim 2
Dependent Claim
119 words
In a method for producing a machine-readable coded marking in a surface of a glass workpiece, said method including (a) applying to a selected surface area of said glass workpiece an undercoating comprising a first aqueous suspension consisting essentially of first pigment particles and a first alkali silicate binder, (b) drying said undercoating, (c) applying to said dry undercoating an overcoating comprising a second aqueous suspension of second pigment particles and a second alkali silicate binder, (d) drying said overcoating and (e) recessing a plurality of related marks through said overcoating, the improvement wherein at least one of said alkali silicate binders consists essentially of a mixture of dissolved sodium silicate, dissolved potassium silicate, and a lithium-stabilized silica sol.
Claim 3
Dependent Claim
36 words
The method defined in claim 1 wherein the weight percent of dry solids present in said mixture is: ______________________________________
sodium silicate 32 to 43%
potassium silicate
23 to 32%
said silica sol 25 to 45%
______________________________________
Claim 4
Dependent Claim
36 words
The method defined in claim 1 wherein the weight percent of dry solids present in said mixture is ______________________________________
sodium silicate 38 to 42%
potassium silicate
29 to 32%
said silica sol 26 to 30%
______________________________________
Claim 5
Dependent Claim
20 words
The method defined in claim 1 wherein each of said drying steps is conducted at temperatures below about 100° C.
Claim 6
Dependent Claim
22 words
The method defined in claim 4 wherein each of said undercoating and said overcoating is dried in less than about 60 seconds.
Claim 7
Dependent Claim
63 words
In a workpiece comprising a glass main body, a thin undercoating on a portion of said body and a thin overcoating on said undercoating, said overcoating having a plurality of related marks recessed therethrough, said undercoating consisting essentially of first pigment particles and a first alkali silicate binder and said overcoating consisting essentially of second pigment particles and a second alkali silicate binder,
Claim 8
Dependent Claim
63 words
In a workpiece comprising a glass main body, a thin undercoating on a portion of said body and a thin overcoating on said undercoating, said overcoating having a plurality of related marks recessed therethrough, said undercoating consisting essentially of first pigment particles and a first alkali silicate binder and said overcoating consisting essentially of second pigment particles and a second alkali silicate binder,
Claim 9
Dependent Claim
22 words
the improvement wherein at least one of said alkali silicate binders consists essentially of a mixture of sodium, potassium and lithium silicates.
Claim 10
Dependent Claim
22 words
the improvement wherein at least one of said alkali silicate binders consists essentially of a mixture of sodium, potassium and lithium silicates.
Claim 11
Dependent Claim
25 words
The workpiece defined in claim 6 wherein said first pigment particles and said second pigment particles have contrasting optical properties with respect to one another.
Claim 12
Dependent Claim
18 words
The workpiece defined in claim 6 wherein each of said binders consists essentially of said mixture of silicates.
Claim 13
Dependent Claim
38 words
The workpiece defined in claim 6 wherein said mixture of silicates consists essentially of about: ______________________________________
32 to 43 weight % sodium silicate
23 to 32 weight % potassium silicate
25 to 45 weight % lithium silicate
______________________________________
Claim 14
Dependent Claim
38 words
The workpiece defined in claim 6 wherein said mixture of silicates consists essentially of about: ______________________________________
38 to 42 weight % sodium silicate
29 to 32 weight % potassium silicate
26 to 30 weight % lithium silicate
______________________________________
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) | 1988-04-29 | 1988-10-29 | 1989-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-29 | 1992-10-29 | 1993-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-29 | 1996-10-29 | 1997-04-30 | $7700.00 | Window Closed / Lapsed |