Patent US5632606A successfully refreshed from Google Patents.
Patent US3331467A successfully refreshed from Google Patents.
US3331467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stairway suspended from stringers
Assignee: Blumcraft of Pittsburgh LP
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Filing: 1964-12-10
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Granted: 1967-07-18
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Expires: 1984-12-10
Abstract
No abstract record available.
Inventors
- 👤 Blum Louis
- 👤 Jr William J Horgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:04
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/02; E04F11/022
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
IN AN INCLINED STAIRWAY, THE COMBINATION COMPRISING (A) A PAIR OF LATERALLY SPACED LOAD BEARING STRINGERS ARCHING FROM THE LOWER TO THE UPPER END PORTIONS THEREOF AND ADAPTED FOR BEING RIGIDLY ANCHORED AT BOTH ENDS, (B) TWO SERIES OF LATERALLY SPACED VERTICALLY EXTENDING BALUSTERS RESPECTIVELY ON THE OUTER SIDES OF, RIGIDLY AFFIXED TO AND SUPPORTED BY SAID STRINGERS, (1) THE UPPER END PORTIONS OF SAID BALUSTERS EXTENDING UPWARDLY FROM SAID STRINGERS, AND (2) THE LOWER END PORTIONS OF SAID BALUSTERS DEPENDING FROM SAID STRINGERS, (C) A SERIES OF TREADS EACH HAVING OPPOSITE END PORTIONS RIGIDLY AFFIXED RESPECTIVELY TO THE LOWER END PORTIONS OF OPPOSED BALUSTERS, AND (D) A PAIR OF HANDRAILS DISPOSED RESPECTIVELY OVER SAID STRINGERS AND EACH AFFIXED TO THE UPPER END PORTIONS OF THE ASSOCIATED BALUSTERS IN SPACED RELATION TO THE UNDERLYING STRINGERS.
Claim 2
Dependent Claim
135 words
IN AN INCLINED STAIRWAY, THE COMBINATION COMPRISING (A) A PAIR OF LATERALLY SPACED LOAD BEARING STRINGERS ARCHING FROM THE LOWER TO THE UPPER END PORTIONS THEREOF AND ADAPTED FOR BEING RIGIDLY ANCHORED AT BOTH ENDS, (B) TWO SERIES OF LATERALLY SPACED VERTICALLY EXTENDING BALUSTERS RESPECTIVELY ON THE OUTER SIDES OF, RIGIDLY AFFIXED TO AND SUPPORTED BY SAID STRINGERS, (1) THE UPPER END PORTIONS OF SAID BALUSTERS EXTENDING UPWARDLY FROM SAID STRINGERS, AND (2) THE LOWER END PORTIONS OF SAID BALUSTERS DEPENDING FROM SAID STRINGERS, (C) A SERIES OF TREADS EACH HAVING OPPOSITE END PORTIONS RIGIDLY AFFIXED RESPECTIVELY TO THE LOWER END PORTIONS OF OPPOSED BALUSTERS, AND (D) A PAIR OF HANDRAILS DISPOSED RESPECTIVELY OVER SAID STRINGERS AND EACH AFFIXED TO THE UPPER END PORTIONS OF THE ASSOCIATED BALUSTERS IN SPACED RELATION TO THE UNDERLYING STRINGERS.
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) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |