US3091718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant lumen maintenance lamp
Assignee: Duro Test Corp
•
Filing: 1960-07-08
•
Granted: 1963-05-28
•
Expires: 1980-07-08
Abstract
No abstract record available.
Inventors
- 👤 Shurgan Joel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:07
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/52; H01K1/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
IN A LAMP COMPRISING A METALLIC FILAMENT WITHIN AN ENVELOPE, A GASEOUS COMPOUND WITHIN SAID ENVELOPE SELECTED FROM THE GROUP CONSISTING OF HYDROGEN CHLORIDE, HYDROGEN BROMIDE AND HYDROGEN IODIDE, SAID ENVELOPE FORMED OF A MATERIAL CONTAINING SILICA WHICH HAS SUBSTANTIALLY THE SAME OR GREATER PERMEABILITY TO HYDROGEN AS FUSED SILICA, THEREBY THE HYDROGEN IS ABLE TO DIFFUSE OUT THROUGH SAID ENVELOPE UPON DISASSOCIATION FROM SAID GASEOUS COMPOUND.
Claim 2
Dependent Claim
67 words
IN A LAMP COMPRISING A METALLIC FILAMENT WITHIN AN ENVELOPE, A GASEOUS COMPOUND WITHIN SAID ENVELOPE SELECTED FROM THE GROUP CONSISTING OF HYDROGEN CHLORIDE, HYDROGEN BROMIDE AND HYDROGEN IODIDE, SAID ENVELOPE FORMED OF A MATERIAL CONTAINING SILICA WHICH HAS SUBSTANTIALLY THE SAME OR GREATER PERMEABILITY TO HYDROGEN AS FUSED SILICA, THEREBY THE HYDROGEN IS ABLE TO DIFFUSE OUT THROUGH SAID ENVELOPE UPON DISASSOCIATION FROM SAID GASEOUS COMPOUND.
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) | 1966-05-27 | 1966-11-26 | 1967-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-27 | 1970-11-26 | 1971-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-27 | 1974-11-26 | 1975-05-28 | $7700.00 | Window Closed / Lapsed |