Patent US3231490A successfully refreshed from Google Patents.
Patent US3213579A successfully refreshed from Google Patents.
US3213579A
Expired / Lapsed
US
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Stairway construction
Assignee: Individual
•
Filing: 1962-10-23
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Granted: 1965-10-26
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Expires: 1982-10-23
Abstract
No abstract record available.
Inventors
- 👤 Clarence M Neher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:47
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/02; E04F11/022
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
A STAIRWAY CONSTRUCTION WHICH COMPRISES A PLURALITY OF TREADS WHICH ARE LONGER FROM SIDE TO SIDE THAN THEY ARE FROM FRONT TO BACK AND A CORRESPONDING NUMBER OF INDIVIDUAL POLE-LIKE SUPPORT MEMBERS, EACH TREAD BEING AFFIXED TO THE UPPER END OF ONE OF SAID MEMBERS SO AS TO FORM A PLURALITY OF T-SHAPED STEPS, EACH SUCCEEDING SUPPORT MEMBER DIFFERING LENGTH FROM ITS PRECEEDING SUPPORT MEMBER BY THE HEIGHT OF A STEP, THE T-SHAPED STEPS BEING ARRANGED IN THE ASCENDING-DESCENDING RELATIONSHIP OF A STAIRWAY SUCH THAT THE LATERAL AXIS OF EACH TREAD IS TRANSVERSE TO THE LINE OF FLIGHT OF THE STAIRWAY AND IS SUBSTANTIALLY PERPENDICULAR TO AN IMAGINARY LINE CONNECTING THE CENTERS OF SAID SUPPORT MEMBERS, EACH SUCH TREAD BEING FREE FROM DIRECT PHYSICAL CONNECTION WITH THE SUCCEEDING TREAD, THE LEADING EDGE OF EACH TREAD OVERHANGING THE TRAILING EDGE OF THE NEXT LOWER TREAD SUCH THAT THE
Claim 2
Dependent Claim
147 words
A STAIRWAY CONSTRUCTION WHICH COMPRISES A PLURALITY OF TREADS WHICH ARE LONGER FROM SIDE TO SIDE THAN THEY ARE FROM FRONT TO BACK AND A CORRESPONDING NUMBER OF INDIVIDUAL POLE-LIKE SUPPORT MEMBERS, EACH TREAD BEING AFFIXED TO THE UPPER END OF ONE OF SAID MEMBERS SO AS TO FORM A PLURALITY OF T-SHAPED STEPS, EACH SUCCEEDING SUPPORT MEMBER DIFFERING LENGTH FROM ITS PRECEEDING SUPPORT MEMBER BY THE HEIGHT OF A STEP, THE T-SHAPED STEPS BEING ARRANGED IN THE ASCENDING-DESCENDING RELATIONSHIP OF A STAIRWAY SUCH THAT THE LATERAL AXIS OF EACH TREAD IS TRANSVERSE TO THE LINE OF FLIGHT OF THE STAIRWAY AND IS SUBSTANTIALLY PERPENDICULAR TO AN IMAGINARY LINE CONNECTING THE CENTERS OF SAID SUPPORT MEMBERS, EACH SUCH TREAD BEING FREE FROM DIRECT PHYSICAL CONNECTION WITH THE SUCCEEDING TREAD, THE LEADING EDGE OF EACH TREAD OVERHANGING THE TRAILING EDGE OF THE NEXT LOWER TREAD SUCH THAT THE
References Cited (Backward Citations)
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US107482A
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US323646A
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US372941A
Cited
US705794A
Cited
AT93277B
Cited
US1776510A
Cited
FR1271996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-25 | 1969-04-26 | 1969-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-25 | 1973-04-26 | 1973-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-25 | 1977-04-26 | 1977-10-26 | $7700.00 | Window Closed / Lapsed |