Patent US4079548A successfully refreshed from Google Patents.
US4079548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double baffle linen chute fire safety door
Assignee: Individual
•
Filing: 1977-01-17
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Granted: 1978-03-21
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Expires: 1997-01-17
Abstract
Abstract A door for a linen chute for a building such as a hotel or hospital, the door having a double baffle so to insure against fire going therethrough, the double baffle comprising two individually hinged door plates, one behind the other.
Inventors
- 👤 Nathan J. Zaccaria
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:17
CPC Classifications
E; E06; E06B; E06B5/00; E06B5/10; E06B5/16; E04; E04F; E04F17/00; E04F17/10; E04F17/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
165 words
A double baffle linen chute fire safety door comprising in combination, an existing door assembly and an additional door assembly attachable to said existing door assembly; said existing door assembly comprising a throat installed in an entrance of a building linen chute, an existing door frame comprising a collar screwed into said throat and an outward flange extending from said collar adapted to be positioned to abut a wall surface of the building, and a circular door hingedly supported on said collar; said additional door assembly comprising an additional door frame having a thin rear wall, an opening through said thin wall for receiving therethrough said collar, said outward flange abutting said thin wall, whereby said thin wall is sandwiched between said outward flange and the wall surface when said collar is screwed into said throat, mounting openings on said thin wall for receiving mounting screws to mount said additional frame onto the wall surface, and an additional door hingedly supported on said additional frame.
Claim 2
Dependent Claim
165 words
A double baffle linen chute fire safety door comprising in combination, an existing door assembly and an additional door assembly attachable to said existing door assembly; said existing door assembly comprising a throat installed in an entrance of a building linen chute, an existing door frame comprising a collar screwed into said throat and an outward flange extending from said collar adapted to be positioned to abut a wall surface of the building, and a circular door hingedly supported on said collar; said additional door assembly comprising an additional door frame having a thin rear wall, an opening through said thin wall for receiving therethrough said collar, said outward flange abutting said thin wall, whereby said thin wall is sandwiched between said outward flange and the wall surface when said collar is screwed into said throat, mounting openings on said thin wall for receiving mounting screws to mount said additional frame onto the wall surface, and an additional door hingedly supported on said additional frame.
Claim 3
Dependent Claim
19 words
The combination as set forth in claim 1 and wherein said circular door is smaller than said additional door.
Claim 4
Dependent Claim
18 words
The combination as in claim 1 and wherein said throat is inwardly spaced from the building wall surface.
Claim 5
Dependent Claim
26 words
The combination as in claim 1 and wherein said circular door has a key operated lock and said additional door has a flush mounted door pull.
Claim 6
Dependent Claim
56 words
The combination as set forth in claim 1 and wherein said existing door frame further comprises a recessed seat for receiving said circular door, wherein said additional door frame comprises a recessed seat for receiving said additional door, and wherein said two doors are adjacently spaced from each other when both are in a closed position.
Claim 7
Dependent Claim
32 words
The combination as set forth in claim 5 and wherein said circular door is flush mounted with said outward flange and said additional door is flush mounted with said additional door frame.
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) | 1981-03-20 | 1981-09-19 | 1982-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-20 | 1985-09-19 | 1986-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-20 | 1989-09-19 | 1990-03-21 | $7700.00 | Window Closed / Lapsed |