US4004384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stairway unit
Assignee: CUROCO
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Filing: 1976-02-06
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Granted: 1977-01-25
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Expires: 1996-02-06
Abstract
Abstract A stairway unit for a multi-level construction including briefly: a one-piece metal member forming both treads and risers, parallel metal stringer members each presenting a vertical planar side to the one-piece metal member; and the edges only of the one-piece metal member being connected to the stringers as by welding. No additional tread members are required and the stairway may be used as is, or with the addition of pads and carpeting to the treads and/or risers or with other suitable covers.
Inventors
- 👤 Murray C. Hood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:20
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/02; E04F11/022; E04F11/025
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
94 words
A stairway unit comprising: a. a single sheet metal member forming the treads and risers and having parallel side edges; b. a pair of stringers each having a planar, vertical-face side; c. said sheet metal member being connected at its edges only to the vertical-face sides of said stringers; and d. a plurality of axially aligned channel-shaped brackets connected to the underside of a plurality of said treads having a laterally extending base joined on their outer sides to said treads and integrally connected downwardly extending flanges adapted for bendably engaging a furring strip.
Claim 2
Dependent Claim
94 words
A stairway unit comprising: a. a single sheet metal member forming the treads and risers and having parallel side edges; b. a pair of stringers each having a planar, vertical-face side; c. said sheet metal member being connected at its edges only to the vertical-face sides of said stringers; and d. a plurality of axially aligned channel-shaped brackets connected to the underside of a plurality of said treads having a laterally extending base joined on their outer sides to said treads and integrally connected downwardly extending flanges adapted for bendably engaging a furring strip.
Claim 3
Dependent Claim
165 words
A stairway unit comprising: a. a single sheet metal member forming the treads and risers and having parallel side edges; b. a pair of stringers each having a planar, vertical-face side; c. said sheet metal member being connected at its edges only to the vertical-face sides of said stringers; d. one of said stringers is shaped in the form of an elongated box including a pair of parallel vertical sides integrally joined by upper and lower end members; e. a plurality of tube pickets connected at their upper ends to a railing; f. a rolled channel member connected to the upper side of said stringer and formed with a plurality of openings for attachably receiving the lower ends of said pickets; g. end posts connected at their upper ends to said railing and having a length extending through said upper end member to approximately said lower end member, and h. clip members connected to said stringer and laterally engaging said lower ends of said posts.
Claim 4
Dependent Claim
165 words
A stairway unit comprising: a. a single sheet metal member forming the treads and risers and having parallel side edges; b. a pair of stringers each having a planar, vertical-face side; c. said sheet metal member being connected at its edges only to the vertical-face sides of said stringers; d. one of said stringers is shaped in the form of an elongated box including a pair of parallel vertical sides integrally joined by upper and lower end members; e. a plurality of tube pickets connected at their upper ends to a railing; f. a rolled channel member connected to the upper side of said stringer and formed with a plurality of openings for attachably receiving the lower ends of said pickets; g. end posts connected at their upper ends to said railing and having a length extending through said upper end member to approximately said lower end member, and h. clip members connected to said stringer and laterally engaging said lower ends of said posts.
Claim 5
Dependent Claim
98 words
A stairway unit comprising: a. a single sheet metal member forming the treads and risers and having parallel side edges; b. a pair of stringers each having a planar, vertical-face side; c. said sheet metal member being connected at its edges only to the vertical-face sides of said stringers; and d. said uppermost tread member is adapted to rest upon the floor of an upper landing and is attached thereto to prevent relative movement therebetween; and e. said lowermost tread member is adapted to rest upon the floor of a lower land and is free to slide thereupon.
Claim 6
Dependent Claim
98 words
A stairway unit comprising: a. a single sheet metal member forming the treads and risers and having parallel side edges; b. a pair of stringers each having a planar, vertical-face side; c. said sheet metal member being connected at its edges only to the vertical-face sides of said stringers; and d. said uppermost tread member is adapted to rest upon the floor of an upper landing and is attached thereto to prevent relative movement therebetween; and e. said lowermost tread member is adapted to rest upon the floor of a lower land and is free to slide thereupon.
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) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |