US3196981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable ladder
Assignee: Individual
•
Filing: 1963-03-08
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Granted: 1965-07-27
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Expires: 1983-03-08
Abstract
No abstract record available.
Inventors
- 👤 Winnall Whitford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:45
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/02; E06C1/14; E06C1/16; E06C1/20; E06C1/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
188 words
AN ADJUSTABLE LADDER COMPRISING AN UPPER SECTION AND A LOWER SECTION, FRONT STILES AND REAR STILES ON EACH SAID SECTION, THE FRONT STILES ON THE UPPER SECTION, THE REAR ENGAGING THE FRONT STILES ON THE LOWER SECTION, THE REAR STILES OF THE UPPER SECTION SLIDABLY ENGAGING THE REAR STILES OF THE LOWER SECTION, A FIRST HYDRAULIC RAM BETWEEN THE UPPER AND LOWER FRONT SECTIONS, A SECOND HYDRAULIC RAM BETWEEN THE UPPER AND LOWER REAR SECTIONS, HYDRAULIC PUMP MEANS ON THE LADDER, VALVE MEANS BETWEEN THE PUMP MEANS AND THE RAMS, VALVE CONTROL MEANS AT THE UPPER END OF THE FRONT LADDER SECTION, A SERIES OF RUNGS BETWEEN SAID FROANT STILES OF SAID UPPER SECTION, A PAIR OF LOWER PULLEYS ONE ON EACH OF THE LOWER ENDS OF SAID FRONT STILES ON THE LOWERO SECTION, A PAIR OF UPPER PULLEYS ATTACHED TO THE UPPER END OF SAID FIRST HYDRAULIC RAM AND A FLEXIBLE LADDER COMPRISING FLEXIBLE SIDE MEMBERS AND RIGID RUNGS, EACH FLEXIBLE SIDE MEMBER BEING SECURED AT BOTH ITS ENDS TO THE LOWER END OF SAID UPPER SECTION BUT PASSING OVER AN UPPER AND A LOWER SAID PULLEY.
Claim 2
Dependent Claim
188 words
AN ADJUSTABLE LADDER COMPRISING AN UPPER SECTION AND A LOWER SECTION, FRONT STILES AND REAR STILES ON EACH SAID SECTION, THE FRONT STILES ON THE UPPER SECTION, THE REAR ENGAGING THE FRONT STILES ON THE LOWER SECTION, THE REAR STILES OF THE UPPER SECTION SLIDABLY ENGAGING THE REAR STILES OF THE LOWER SECTION, A FIRST HYDRAULIC RAM BETWEEN THE UPPER AND LOWER FRONT SECTIONS, A SECOND HYDRAULIC RAM BETWEEN THE UPPER AND LOWER REAR SECTIONS, HYDRAULIC PUMP MEANS ON THE LADDER, VALVE MEANS BETWEEN THE PUMP MEANS AND THE RAMS, VALVE CONTROL MEANS AT THE UPPER END OF THE FRONT LADDER SECTION, A SERIES OF RUNGS BETWEEN SAID FROANT STILES OF SAID UPPER SECTION, A PAIR OF LOWER PULLEYS ONE ON EACH OF THE LOWER ENDS OF SAID FRONT STILES ON THE LOWERO SECTION, A PAIR OF UPPER PULLEYS ATTACHED TO THE UPPER END OF SAID FIRST HYDRAULIC RAM AND A FLEXIBLE LADDER COMPRISING FLEXIBLE SIDE MEMBERS AND RIGID RUNGS, EACH FLEXIBLE SIDE MEMBER BEING SECURED AT BOTH ITS ENDS TO THE LOWER END OF SAID UPPER SECTION BUT PASSING OVER AN UPPER AND A LOWER SAID PULLEY.
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) | 1968-07-26 | 1969-01-25 | 1969-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-26 | 1973-01-25 | 1973-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-26 | 1977-01-25 | 1977-07-27 | $7700.00 | Window Closed / Lapsed |