US3189141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire door construction
Assignee: DUSING AND HUNT Inc
•
Filing: 1960-04-04
•
Granted: 1965-06-15
•
Expires: 1980-04-04
Abstract
No abstract record available.
Inventors
- 👤 Leon F Dusing
- 👤 Charles F Dusing
- 👤 Carl F Gerhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:58
CPC Classifications
E; E06; E06B; E06B5/00; E06B5/10; E06B5/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
IN A FIRE DOOR, GENERALLY RECTANGULAR SLAB MEANS OF INSULATING MATERIAL EXTENDING SUBSTANTIALLY THE HEIGHT OF THE DOOR, SHEET METAL FACING MEMBERS ATTACHED TO THE OPPOSITE FACES OF SAID SLAB MEANS, TOP FRAMING CHANNEL MEANS FORMING A LONGITUDINAL PASSAGE ALONG THE TOP OF SAID DOOR DIRECTLY ABOVE THE SLAB MATERIAL, SAID LONGITUDINAL PASSAGE BEING OPEN TO THE ATMOSPHERE AT AT LEAST ONE END OF SAID DOOR, AND NOTCHES ALONG THE UPPER EDGES OF SAID SLAB MEANS EXTENDING DOWNWARDLY BELOW SAID TOP FRAMING CHANNEL MEANS TO PERMIT ESCAPE OF GAS FROM BETWEEN THE FACING SHEETS AND THE SLAB MEANS TO SAID LONGITUDINAL PASSAGE.
Claim 2
Dependent Claim
102 words
IN A FIRE DOOR, GENERALLY RECTANGULAR SLAB MEANS OF INSULATING MATERIAL EXTENDING SUBSTANTIALLY THE HEIGHT OF THE DOOR, SHEET METAL FACING MEMBERS ATTACHED TO THE OPPOSITE FACES OF SAID SLAB MEANS, TOP FRAMING CHANNEL MEANS FORMING A LONGITUDINAL PASSAGE ALONG THE TOP OF SAID DOOR DIRECTLY ABOVE THE SLAB MATERIAL, SAID LONGITUDINAL PASSAGE BEING OPEN TO THE ATMOSPHERE AT AT LEAST ONE END OF SAID DOOR, AND NOTCHES ALONG THE UPPER EDGES OF SAID SLAB MEANS EXTENDING DOWNWARDLY BELOW SAID TOP FRAMING CHANNEL MEANS TO PERMIT ESCAPE OF GAS FROM BETWEEN THE FACING SHEETS AND THE SLAB MEANS TO SAID LONGITUDINAL PASSAGE.
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US1257476A
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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) | 1968-06-14 | 1968-12-14 | 1969-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-14 | 1972-12-14 | 1973-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-14 | 1976-12-14 | 1977-06-15 | $7700.00 | Window Closed / Lapsed |