US2918595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating composition for electric lamps
Assignee: General Electric Co
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Filing: 1957-04-29
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Granted: 1959-12-22
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Expires: 1977-04-29
Abstract
No abstract record available.
Inventors
- 👤 George W Cressman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:44
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/28; H01K1/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
AN ELECTRIC LIGHT BULB HAVING A COATING DEPOSITED BY VAPORIZATION ON THE INSIDE SURFACE OF ITS GLASS ENVELOPE, SAID COATING COMPRISING FROM 6-11.2% ALUMINUM, 1.5-4.25% IRON, AND THE BALANCE ESSENTIALLY COPPER.
Claim 2
Dependent Claim
31 words
AN ELECTRIC LIGHT BULB HAVING A COATING DEPOSITED BY VAPORIZATION ON THE INSIDE SURFACE OF ITS GLASS ENVELOPE, SAID COATING COMPRISING FROM 6-11.2% ALUMINUM, 1.5-4.25% IRON, AND THE BALANCE ESSENTIALLY COPPER.
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) | 1962-12-21 | 1963-06-22 | 1963-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-21 | 1967-06-22 | 1967-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-21 | 1971-06-22 | 1971-12-22 | $7700.00 | Window Closed / Lapsed |