Patent US3885182A successfully refreshed from Google Patents.
US3885182A
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US
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Lamp having light diffusing envelope
Assignee: GTE Sylvania Inc
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Filing: 1973-09-20
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Granted: 1975-05-20
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Expires: 1993-09-20
Abstract
Abstract An incandescent lamp has an envelope made of partially crystallized glass in order to diffuse the light emanating from the filament.
Inventors
- 👤 Gordon P K Chu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:32
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0054; H; H01; H01K; H01K1/00; H01K1/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
AN INCENDENSENT LAMP COMPRISING A FILAMENT DISPOSED WITHIN A LIGHT DIFFUSING UNIFORMLY CRYSTALLIZD GLASS ENVELOPE, THE ENTIRE ENVELOPE BEING CRYSTALIZED, WHICH IS SEALED AT ITS LOWER END TO THE FLARE OF A STEM PRESS GLASS MOUNT, THE ENVELOPE HAVING A HIGH EFFICIENCY OF LIGHT TRANSMISSION, THE GLASS COMPOSITION OF SAID ENVELOPE BEING AS FOLLOWS: LIO2 N TO 20% NA2O AND/OR K2O 1 TO 70% SIO2 45 TO 72% AL2O3 4 TO 20% CAO AND/OR SRO AND/OR BAO AND/OR MGO 0.6 TO 7% BEO3 1 TO 4% AS2O3 AND/OOR SB2O3 AND/OR P2O5 AND/OR MOO3 2 TO 7%.
Claim 2
Dependent Claim
96 words
AN INCENDENSENT LAMP COMPRISING A FILAMENT DISPOSED WITHIN A LIGHT DIFFUSING UNIFORMLY CRYSTALLIZD GLASS ENVELOPE, THE ENTIRE ENVELOPE BEING CRYSTALIZED, WHICH IS SEALED AT ITS LOWER END TO THE FLARE OF A STEM PRESS GLASS MOUNT, THE ENVELOPE HAVING A HIGH EFFICIENCY OF LIGHT TRANSMISSION, THE GLASS COMPOSITION OF SAID ENVELOPE BEING AS FOLLOWS: LIO2 N TO 20% NA2O AND/OR K2O 1 TO 70% SIO2 45 TO 72% AL2O3 4 TO 20% CAO AND/OR SRO AND/OR BAO AND/OR MGO 0.6 TO 7% BEO3 1 TO 4% AS2O3 AND/OOR SB2O3 AND/OR P2O5 AND/OR MOO3 2 TO 7%.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |