US2840490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamp envelope coating and method of applying
Assignee: Westinghouse Electric Corp
•
Filing: 1953-12-02
•
Granted: 1958-06-24
•
Expires: 1973-12-02
Abstract
No abstract record available.
Inventors
- 👤 Robert E Collins
- 👤 Vernon L Plagge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:37
CPC Classifications
H; H01; H01K; H01K3/00; H01K3/005; Y; Y10; Y10T; Y10T428/00; Y10T428/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
IN COMBINATION, A VITREOUS ENVELOPE OF BOROSILICATE GLASS HAVING A MELTING POINT OF ABOUT 820*C. AND A COEFFICIENT OF EXPANSION OF ABOUT 32.5 X 10-7 AND AN OPAQUE EXTERIOR COATING FOR SAID ENVELOPE CONSISTING OF A FIRED MIXTURE OF TWO FINELY-DIVIDED VITREOUS MATERIALS HAVING ADMIXED THEREWITH AN OPAQUE PIGMENT, ONE OF SAID FIRED, MIXED VITREOUS MATERIALS BEING A BOROSILICATE GLASS HAVING A COEFFICIENT OF EXPANSION AND A MELTING POINT APPROXIMATELY EQUAL TO THE COEFFICIENT OF EXPANSION AND THE MELTING POINT OF SAID VITREOUS ENVELOPE, THE OTHER OF SAID FIRED VITREOUS MATERIALS BEING A BOROSILICATE GLASS HAVING A SOFTENING POINT OF ABOUT 755*C. AND A COEFFICIENT OF EXCONSTITUTING NOT LESS THAN 10% NOR MORE THAN 60% BY WEIGHT OF SAID MIXTURE OF FIRED VITREOUS MATERIALS, SAID OTHER FIRED VITREOUS MATERIAL BEING PARTIALLY FUSED IN SITU TO SAID ONE FIRED VITREOUS MATERIAL AND PARTIALLY FUSED IN SITU ONTO SAID VITREOUS ENVELOPE, AND SAID COATING HAVING A THICKENESS OF NOT LESS THAN 0.003 NOR MORE THAN 0.006".
Claim 2
Dependent Claim
164 words
IN COMBINATION, A VITREOUS ENVELOPE OF BOROSILICATE GLASS HAVING A MELTING POINT OF ABOUT 820*C. AND A COEFFICIENT OF EXPANSION OF ABOUT 32.5 X 10-7 AND AN OPAQUE EXTERIOR COATING FOR SAID ENVELOPE CONSISTING OF A FIRED MIXTURE OF TWO FINELY-DIVIDED VITREOUS MATERIALS HAVING ADMIXED THEREWITH AN OPAQUE PIGMENT, ONE OF SAID FIRED, MIXED VITREOUS MATERIALS BEING A BOROSILICATE GLASS HAVING A COEFFICIENT OF EXPANSION AND A MELTING POINT APPROXIMATELY EQUAL TO THE COEFFICIENT OF EXPANSION AND THE MELTING POINT OF SAID VITREOUS ENVELOPE, THE OTHER OF SAID FIRED VITREOUS MATERIALS BEING A BOROSILICATE GLASS HAVING A SOFTENING POINT OF ABOUT 755*C. AND A COEFFICIENT OF EXCONSTITUTING NOT LESS THAN 10% NOR MORE THAN 60% BY WEIGHT OF SAID MIXTURE OF FIRED VITREOUS MATERIALS, SAID OTHER FIRED VITREOUS MATERIAL BEING PARTIALLY FUSED IN SITU TO SAID ONE FIRED VITREOUS MATERIAL AND PARTIALLY FUSED IN SITU ONTO SAID VITREOUS ENVELOPE, AND SAID COATING HAVING A THICKENESS OF NOT LESS THAN 0.003 NOR MORE THAN 0.006".
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) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |