Patent US3216526A successfully refreshed from Google Patents.
US3216526A
Expired / Lapsed
US
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Ladders
Assignee: RACOLE TRADING AND Manufacturing CO Ltd
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Filing: 1962-12-17
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Granted: 1965-11-09
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Expires: 1982-12-17
Abstract
No abstract record available.
Inventors
- 👤 Cole Rudolf Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:57
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/02; E06C1/04; E06C1/08; E06C1/10; E06C1/52; E06C7/00; E06C7/08; E06C7/082; E06C7/083
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A COLLAPSIBLE LADDER COMPRISING IN COMBINATION: A PLURALITY OF SECTIONS; EACH OF SAID SECTIONS INCLUDING TWO LONGITUDINAL STRINGERS; AT LEAST ONE RUNG INTERCONNECTING EACH PAIR OF STRINGERS; SAID RUNG BEING DISPOSED BETWEEN SAID STRINGERS AT A POSITION INTERMEDIATE THE ENDS OF SAID STRINGERS; SAID RUNG BEING FORMED WITH A SUBSTANTIALLY FLAT UPPER SURFACE AT SUCH AN ANGLE THAT WHEN THE LADDER IS IN ITS EXTENDED POSITION OF USE AT AN ANGLE, AS WHEN SET IN THE POSITION OF USE AGAINST A VERTICAL WALL, THE UPPER SURFACE OF THE RUNG IS SUBSTANTIALLY PARALLEL TO THE GROUND; PIVOT MEANS CONNECTING SAID SECTIONS TOGETHER; SAID PIVOT MEANS COMPRISING A MALE MEM-
Claim 2
Dependent Claim
108 words
A COLLAPSIBLE LADDER COMPRISING IN COMBINATION: A PLURALITY OF SECTIONS; EACH OF SAID SECTIONS INCLUDING TWO LONGITUDINAL STRINGERS; AT LEAST ONE RUNG INTERCONNECTING EACH PAIR OF STRINGERS; SAID RUNG BEING DISPOSED BETWEEN SAID STRINGERS AT A POSITION INTERMEDIATE THE ENDS OF SAID STRINGERS; SAID RUNG BEING FORMED WITH A SUBSTANTIALLY FLAT UPPER SURFACE AT SUCH AN ANGLE THAT WHEN THE LADDER IS IN ITS EXTENDED POSITION OF USE AT AN ANGLE, AS WHEN SET IN THE POSITION OF USE AGAINST A VERTICAL WALL, THE UPPER SURFACE OF THE RUNG IS SUBSTANTIALLY PARALLEL TO THE GROUND; PIVOT MEANS CONNECTING SAID SECTIONS TOGETHER; SAID PIVOT MEANS COMPRISING A MALE MEM-
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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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |