US3137804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Explosion-proof lamp
Assignee: Engelhard Hanovia Inc
•
Filing: 1960-09-30
•
Granted: 1964-06-16
•
Expires: 1980-09-30
Abstract
No abstract record available.
Inventors
- 👤 Harry S Rubens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:23
CPC Classifications
F; F21; F21V; F21V25/00; F21V25/12; F21L; F21L14/00; F21V25/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
AN EXPLOSION-PROOF LAMP COMPRISING AN INCANDESCENT LIGHT BULB HAVING AN ELECTRICALLY CONDUCTING BASE MOUNTED THEREON, AN OUTER ENVELOPE ENCOMPASSING THE BULB AND FORMING A SPACE THEREBETWEEN, FIRST CLOSURE MEANS AT ONE END OF THE ENVELOPE, THE BASE BEING MOUNTED IN AND HERMETICALLY SEALED THROUGH SAID FIRST CLOSURE MEANS, A SECOND CLOSURE MEANS HERMETICALLY SEALED TO THE OTHER END OF THE ENVELOPE, THE SECOND CLOSURE MEANS COMPRISING A LAMINATED LIGHT-TRANSMISSIVE DISC, THE DISC BEING IN DIRECT CONTACT WITH THE BULB AND FORMED OF A PLURALITY OF GLASS LAYERS HAVING A FLEXIBLE LIGHT-TRANSMISSIVE MEMBRANE THEREBETWEEN, AND AN OXYGEN-CONTAINING GAS FILLING SAID SPACE.
Claim 2
Dependent Claim
100 words
AN EXPLOSION-PROOF LAMP COMPRISING AN INCANDESCENT LIGHT BULB HAVING AN ELECTRICALLY CONDUCTING BASE MOUNTED THEREON, AN OUTER ENVELOPE ENCOMPASSING THE BULB AND FORMING A SPACE THEREBETWEEN, FIRST CLOSURE MEANS AT ONE END OF THE ENVELOPE, THE BASE BEING MOUNTED IN AND HERMETICALLY SEALED THROUGH SAID FIRST CLOSURE MEANS, A SECOND CLOSURE MEANS HERMETICALLY SEALED TO THE OTHER END OF THE ENVELOPE, THE SECOND CLOSURE MEANS COMPRISING A LAMINATED LIGHT-TRANSMISSIVE DISC, THE DISC BEING IN DIRECT CONTACT WITH THE BULB AND FORMED OF A PLURALITY OF GLASS LAYERS HAVING A FLEXIBLE LIGHT-TRANSMISSIVE MEMBRANE THEREBETWEEN, AND AN OXYGEN-CONTAINING GAS FILLING SAID SPACE.
References Cited (Backward Citations)
US1695794A
Cited
US2567713A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |