US4054084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire and smoke free system for high rise building stairways
Assignee: Individual
•
Filing: 1975-11-18
•
Granted: 1977-10-18
•
Expires: 1995-11-18
Abstract
Abstract A fire and smoke free stairway in the event of fire in high rise buildings can be maintained by developing a velocity pressure of air through the fire doorway, from the fire stairway each time the door is opened during evacuation and without pressurizing the stairway significantly.
Inventors
- 👤 William Francis Palmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:49
CPC Classifications
A; A62; A62B; A62B3/00; F; F24; F24F; F24F9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A fire control device to maintain a smoke and fire free escape from a multi-floor building having a stair shaft, comprising an entrance door to the stair shaft from each floor, a first fan supplying a variable quantity of external air, in proportion to the number of entrance doors open, to said stair shaft when activated, a second fan directing a flow of air through the doorway of said entrance door when said door is opened.
Claim 2
Dependent Claim
76 words
A fire control device to maintain a smoke and fire free escape from a multi-floor building having a stair shaft, comprising an entrance door to the stair shaft from each floor, a first fan supplying a variable quantity of external air, in proportion to the number of entrance doors open, to said stair shaft when activated, a second fan directing a flow of air through the doorway of said entrance door when said door is opened.
References Cited (Backward Citations)
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Cited
US3715968A
Cited
US3739707A
Cited
US3826180A
Cited
US3817161A
Cited
US3926101A
Cited
US3952452A
Cited
US3884133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |