Patent US3075612A successfully refreshed from Google Patents.
US3075612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emergency escape ladder
Assignee: COMBINED IND Inc
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Filing: 1961-07-17
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Granted: 1963-01-29
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Expires: 1981-07-17
Abstract
No abstract record available.
Inventors
- 👤 Sidney S Gould
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:12
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/52; E06C1/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A LADDER COMPRISING A PAIR OF FLEXIBLE ELONGATE SIDE PIECES AND A PLURALITY OF RUNGS EXTENDING FROM SAID SIDE PIECES, EACH OF SAID RUNGS COMPRISING A GENERALLY CYLINDRICAL TUBULAR MEMBER HAVING A TRANSVERSE CREASE ON ONLY ONE SIDE ADJACENT TO AND SPACED INWARD FROM EACH END OF SAID TUBULAR MEMBER, THE END REGION OF SAID TUBULAR MEMBER BETWEEN EACH CREASE AND THE ADJACENT END BEING CURLED IN ENGAGEMENT ABOUT THE ADJACENT SIDE PIECE FOR SECUREMENT THERETO, SAID END REGIONS EACH BEING CURLED ABOUT AN AXIS INTERSECTING WITH AND GENERALLY NORMAL TO THE AXIS OF SAID TUBULAR MEMBER, SAID FLEXIBLE ELONGATE SIDE PIECES EACH COMPRISING A CHAIN HAVING GENERALLY 8-SHAPED LINKS AND SIAD RUNG END REGIONS EACH BEING BIFURCATED AND HAVING ITS LEGS EACH CURLED IN ENGAGEMENT ABOUT A DIFFERENT LOOP OF THE SAME LINK OF THE ADJACENT CHAIN.
Claim 2
Dependent Claim
138 words
A LADDER COMPRISING A PAIR OF FLEXIBLE ELONGATE SIDE PIECES AND A PLURALITY OF RUNGS EXTENDING FROM SAID SIDE PIECES, EACH OF SAID RUNGS COMPRISING A GENERALLY CYLINDRICAL TUBULAR MEMBER HAVING A TRANSVERSE CREASE ON ONLY ONE SIDE ADJACENT TO AND SPACED INWARD FROM EACH END OF SAID TUBULAR MEMBER, THE END REGION OF SAID TUBULAR MEMBER BETWEEN EACH CREASE AND THE ADJACENT END BEING CURLED IN ENGAGEMENT ABOUT THE ADJACENT SIDE PIECE FOR SECUREMENT THERETO, SAID END REGIONS EACH BEING CURLED ABOUT AN AXIS INTERSECTING WITH AND GENERALLY NORMAL TO THE AXIS OF SAID TUBULAR MEMBER, SAID FLEXIBLE ELONGATE SIDE PIECES EACH COMPRISING A CHAIN HAVING GENERALLY 8-SHAPED LINKS AND SIAD RUNG END REGIONS EACH BEING BIFURCATED AND HAVING ITS LEGS EACH CURLED IN ENGAGEMENT ABOUT A DIFFERENT LOOP OF THE SAME LINK OF THE ADJACENT CHAIN.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-28 | 1966-07-30 | 1967-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-28 | 1970-07-30 | 1971-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-28 | 1974-07-30 | 1975-01-29 | $7700.00 | Window Closed / Lapsed |