US3307653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Demountable stairway unit
Assignee: Individual
•
Filing: 1966-02-07
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Granted: 1967-03-07
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Expires: 1986-02-07
Abstract
No abstract record available.
Inventors
- 👤 Herman O Gnehm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:31
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/02; E04F11/022; E04F11/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A STAIRWAY UNIT FOR DEMOUNTABLE INSTALLATION ON A DEMOUNTABLE SCAFFOLDING STRUCTURE OF THE TYPE BUILT UP OF VERTICALLY DISPOSED, TUBULAR MODULAR COMPONENTS AND HORIZONTAL CONNECTING COMPONENTS FOR ADJACENT ONES OF THE VERTICAL, TUBULAR, MODULAR COMPONENTS; SAID STAIRWAY UNIT COMPRISING A PAIR OF SPACED PARALLEL STRINGER ELEMENTS TO WHICH THE OPPOSITE ENDS OF A PLURALITY OF TREAD ELEMENTS ARE SECURED AND SAID STRINGER ELEMENTS ADDITIONALLY INCLUDING MEANS CAPABLE OF BEING INTERPOSED BETWEEN FOR DEMOUNTABLE ENGAGEMENT WITH SELECTED ADJACENT ONES OF THE VERTICAL, TUBULAR COMPONENTS OF THE SCAFFOLDING STRUCTURE IN SUCH RELATION THERETO THAT THE TOP SURFACES OF THE TREADS ARE DISPOSED IN SUBSTANTIALLY HORIZONTAL PLANES.
Claim 2
Dependent Claim
104 words
A STAIRWAY UNIT FOR DEMOUNTABLE INSTALLATION ON A DEMOUNTABLE SCAFFOLDING STRUCTURE OF THE TYPE BUILT UP OF VERTICALLY DISPOSED, TUBULAR MODULAR COMPONENTS AND HORIZONTAL CONNECTING COMPONENTS FOR ADJACENT ONES OF THE VERTICAL, TUBULAR, MODULAR COMPONENTS; SAID STAIRWAY UNIT COMPRISING A PAIR OF SPACED PARALLEL STRINGER ELEMENTS TO WHICH THE OPPOSITE ENDS OF A PLURALITY OF TREAD ELEMENTS ARE SECURED AND SAID STRINGER ELEMENTS ADDITIONALLY INCLUDING MEANS CAPABLE OF BEING INTERPOSED BETWEEN FOR DEMOUNTABLE ENGAGEMENT WITH SELECTED ADJACENT ONES OF THE VERTICAL, TUBULAR COMPONENTS OF THE SCAFFOLDING STRUCTURE IN SUCH RELATION THERETO THAT THE TOP SURFACES OF THE TREADS ARE DISPOSED IN SUBSTANTIALLY HORIZONTAL PLANES.
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) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |