Patent US3231045A successfully refreshed from Google Patents.
US3231045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collapsible ladder
Assignee: Individual
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Filing: 1964-02-24
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Granted: 1966-01-25
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Expires: 1984-02-24
Abstract
No abstract record available.
Inventors
- 👤 Lavrard Georges Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:03
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/08; E06C7/081; E06C1/00; E06C1/02; E06C1/32; E06C1/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
193 words
A COLLAPSIBLE LADDER COMPRISING, IN COMBINATION: (A) TWO ELONGATED SIDE RAILS, EACH SIDE RAIL BEING MAINLY CONSTITUTED BY A PLURALITY OF LONGITUDINAL SECTIONS OF TUBULAR MATERIAL DEFINING RESPECTIVE CAVITIES THEREIN, EACH OF SAID PLURALITIES INCLUDING A FIRST SECTION AND A SECOND SECTION JOINTLY CONSTITUTING A PAIR OF LONGITUDINALLY CONSECUTIVE SIDE RAIL SECTIONS; (B) A PLURALITY OF LONGITUDINALLY SPACED RUNGS TRANSVERSLY CONNECTING SAID SIDE RAILS; (C) FIRST AND SECOND HINGE PLATE MEANS RESPECTIVELY FIXEDLY FASTENED TO THE FIRST AND SECOND SIDE RAIL SECTON OF EACH PAIR; (D) HINGE PIN MEANS CONNECTING THE FIRST AND SECOND PLATE MEANS OF EACH PAIR OF SIDE RAIL SECTIONS FOR PIOVOTING MOVEMENT OF SAID SECTIONS ABOUT A TRANSVERSE AXIS; (E) COOPERATING ABUTMENT MEANS ON THE SIDE RAIL SECTIONS OF EACH PAIR FOR ARRESTING SAID PIVOTING MOVEMENT IN ONE DIRECTION IN AN OPERATIVE POSITION IN WHICH THE RAIL SECTIONS OF SAID PAIR ARE LONGITUDINALLY ALIGNED; (F) STOP PIN MEANS MOUNTED IN THE CAVITY OF THE FIRST SECTION OF ONE OF SAID PAIRS, SAID STOP PIN MEANS MOVING WITH SAID FIRST SECTION IN AN ARCUATE PATH WHEN SAID FIRST SECTION IS PIVOTED ABOUT SAID TRANSVERSE AXIS AWAY FROM SAID OPERATIVE POSITION,
Claim 2
Dependent Claim
193 words
A COLLAPSIBLE LADDER COMPRISING, IN COMBINATION: (A) TWO ELONGATED SIDE RAILS, EACH SIDE RAIL BEING MAINLY CONSTITUTED BY A PLURALITY OF LONGITUDINAL SECTIONS OF TUBULAR MATERIAL DEFINING RESPECTIVE CAVITIES THEREIN, EACH OF SAID PLURALITIES INCLUDING A FIRST SECTION AND A SECOND SECTION JOINTLY CONSTITUTING A PAIR OF LONGITUDINALLY CONSECUTIVE SIDE RAIL SECTIONS; (B) A PLURALITY OF LONGITUDINALLY SPACED RUNGS TRANSVERSLY CONNECTING SAID SIDE RAILS; (C) FIRST AND SECOND HINGE PLATE MEANS RESPECTIVELY FIXEDLY FASTENED TO THE FIRST AND SECOND SIDE RAIL SECTON OF EACH PAIR; (D) HINGE PIN MEANS CONNECTING THE FIRST AND SECOND PLATE MEANS OF EACH PAIR OF SIDE RAIL SECTIONS FOR PIOVOTING MOVEMENT OF SAID SECTIONS ABOUT A TRANSVERSE AXIS; (E) COOPERATING ABUTMENT MEANS ON THE SIDE RAIL SECTIONS OF EACH PAIR FOR ARRESTING SAID PIVOTING MOVEMENT IN ONE DIRECTION IN AN OPERATIVE POSITION IN WHICH THE RAIL SECTIONS OF SAID PAIR ARE LONGITUDINALLY ALIGNED; (F) STOP PIN MEANS MOUNTED IN THE CAVITY OF THE FIRST SECTION OF ONE OF SAID PAIRS, SAID STOP PIN MEANS MOVING WITH SAID FIRST SECTION IN AN ARCUATE PATH WHEN SAID FIRST SECTION IS PIVOTED ABOUT SAID TRANSVERSE AXIS AWAY FROM SAID OPERATIVE POSITION,
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) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |