US3290839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stair structure
Assignee: Individual
•
Filing: 1964-03-05
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Granted: 1966-12-13
•
Expires: 1984-03-05
Abstract
No abstract record available.
Inventors
- 👤 Theisen John Wesley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:28
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/02; E04F11/104; E04F11/112; E04F11/022; E04F11/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
233 words
IN COMBINATION WITH TWO LATERALLY SPACED, PARALLEL STRINGERS DISPOSED AT A DESIRED ANGLE RELATIVE TO A FLOOR SURFACE AND INCLUDING A PLURALITY OF PAIRS OF INVERTED, L-SHAPED LATERALLY ALIGNED SUPPORTS AFFIXED TO THE ADJACENT SURFACES THEREOF, A STAIR STRUCTURE, WITH EACH OF SAID SUPPORTS HAVING A FIRST HORIZONTALLY DISPOSED LEG AND A SECOND LEG WHICH EXTENDS DOWNWARDLY FROM THE FORWARD END THEREOF, WHICH STAIR STRUCTURE COMPRISES: (A) A PLURALITY OF ELONGATE PANS, EACH OF WHICH IS OF SUCH LENGTH AS TO SPAN THE DISTANCE BETWEEN SAID STRINGERS, WITH EACH OF SAID PANS INCLUDING A RECTANGULAR SECTION THAT RESTS ON, AND IS SUPPORTED BY, ONE OF SAID FIRST LEGS, A FLANGE PROJECTING UPWARDLY FROM A FORWARD EDGE OF SAID SECTION, AND A U-SHAPED MEMBER SUPPORTED FROM THE REAR PORTION OF SAID SECTION; (B) A PLURALITY OF RISERS, EACH OF WHICH IS OF SUCH LENGTHS AS TO SPAN THE DISTANCE BETWEEN SAID STRINGERS, WITH EACH OF SAID RISERS INCLUDING A RECTANGULAR SECTION THAT ABUTS AGAINST ONE OF SAID SECOND LEGS WHEN SAID SECTION IS SLIDABLY INSERTED IN ONE OF SAID USHAPED MEMBERS, AND AN ENGAGEABLE PORTION ON THE UPPER END OF SAID SECTION THAT IS ENGAGED BY ONE OF SAID FLANGES; (C) MEANS FOR AFFIXING SAID RISERS TO SAID SECOND LEGS; AND (D) A PLURALITY OF BODIES OF NON-METALLIC MATERIAL HAVING FLAT HORIZONTAL UPPER SURFACES, WHICH BODIES ARE SUPPORTED BY SAID PANS TO DEFINE TREADS.
Claim 2
Dependent Claim
233 words
IN COMBINATION WITH TWO LATERALLY SPACED, PARALLEL STRINGERS DISPOSED AT A DESIRED ANGLE RELATIVE TO A FLOOR SURFACE AND INCLUDING A PLURALITY OF PAIRS OF INVERTED, L-SHAPED LATERALLY ALIGNED SUPPORTS AFFIXED TO THE ADJACENT SURFACES THEREOF, A STAIR STRUCTURE, WITH EACH OF SAID SUPPORTS HAVING A FIRST HORIZONTALLY DISPOSED LEG AND A SECOND LEG WHICH EXTENDS DOWNWARDLY FROM THE FORWARD END THEREOF, WHICH STAIR STRUCTURE COMPRISES: (A) A PLURALITY OF ELONGATE PANS, EACH OF WHICH IS OF SUCH LENGTH AS TO SPAN THE DISTANCE BETWEEN SAID STRINGERS, WITH EACH OF SAID PANS INCLUDING A RECTANGULAR SECTION THAT RESTS ON, AND IS SUPPORTED BY, ONE OF SAID FIRST LEGS, A FLANGE PROJECTING UPWARDLY FROM A FORWARD EDGE OF SAID SECTION, AND A U-SHAPED MEMBER SUPPORTED FROM THE REAR PORTION OF SAID SECTION; (B) A PLURALITY OF RISERS, EACH OF WHICH IS OF SUCH LENGTHS AS TO SPAN THE DISTANCE BETWEEN SAID STRINGERS, WITH EACH OF SAID RISERS INCLUDING A RECTANGULAR SECTION THAT ABUTS AGAINST ONE OF SAID SECOND LEGS WHEN SAID SECTION IS SLIDABLY INSERTED IN ONE OF SAID USHAPED MEMBERS, AND AN ENGAGEABLE PORTION ON THE UPPER END OF SAID SECTION THAT IS ENGAGED BY ONE OF SAID FLANGES; (C) MEANS FOR AFFIXING SAID RISERS TO SAID SECOND LEGS; AND (D) A PLURALITY OF BODIES OF NON-METALLIC MATERIAL HAVING FLAT HORIZONTAL UPPER SURFACES, WHICH BODIES ARE SUPPORTED BY SAID PANS TO DEFINE TREADS.
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) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |