Patent US3139154A successfully refreshed from Google Patents.
US3139154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety guard attachments for ladders
Assignee: Individual
•
Filing: 1962-12-14
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Granted: 1964-06-30
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Expires: 1982-12-14
Abstract
No abstract record available.
Inventors
- 👤 Ewald William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:07
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/18; E06C7/185; E06C7/181; E06C7/182
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
IN COMBINATION WITH A LADDER HAVING STEP-SUPPORTING LEGS; A SAFETY GUARD RAIL COMPRISING A VARIABLE LENGTH CROSS MEMBER ADAPTED TO BE POSITIONED ABOVE THE TOP STEP OF SAID LADDER, A PAIR OF DOWNWARDLY DEPENDING SIDE MEMBERS CONNECTED AT THEIR UPPERMOST ENDS TO THE OPPOSED END SECTIONS OF SAID CROSS MEMBER, MEANS CARRIED BY SAID LADDER FOR CONSTRAINING SAID SIDE MEMBERS TO SLIDING MOVEMENT IN RESPECTIVE PATHS DIVERGING RELATIVE TO ONE ANOTHER DOWNWARDLY WITH RESPECT TO SAID TOP STEP OF SAID LADDER, AND MEANS FOR LOCKING SAID CROSS MEMBER AGAINST CHANGE IN LENGTH AT A PLURALITY OF ADJUSTED LENGTHS OF SAID CROSS MEMBER CORRESPONDING, RESPECTIVELY, TO THE LOCATION OF THE SAME AT AN ESSENTIALLY WAIST-HIGH ELEVATION ABOVE THE PLANES OF AT LEAST THE TWO TOP STEPS OF SAID
Claim 2
Dependent Claim
127 words
IN COMBINATION WITH A LADDER HAVING STEP-SUPPORTING LEGS; A SAFETY GUARD RAIL COMPRISING A VARIABLE LENGTH CROSS MEMBER ADAPTED TO BE POSITIONED ABOVE THE TOP STEP OF SAID LADDER, A PAIR OF DOWNWARDLY DEPENDING SIDE MEMBERS CONNECTED AT THEIR UPPERMOST ENDS TO THE OPPOSED END SECTIONS OF SAID CROSS MEMBER, MEANS CARRIED BY SAID LADDER FOR CONSTRAINING SAID SIDE MEMBERS TO SLIDING MOVEMENT IN RESPECTIVE PATHS DIVERGING RELATIVE TO ONE ANOTHER DOWNWARDLY WITH RESPECT TO SAID TOP STEP OF SAID LADDER, AND MEANS FOR LOCKING SAID CROSS MEMBER AGAINST CHANGE IN LENGTH AT A PLURALITY OF ADJUSTED LENGTHS OF SAID CROSS MEMBER CORRESPONDING, RESPECTIVELY, TO THE LOCATION OF THE SAME AT AN ESSENTIALLY WAIST-HIGH ELEVATION ABOVE THE PLANES OF AT LEAST THE TWO TOP STEPS OF SAID
References Cited (Backward Citations)
GB137889A
Cited
US1953390A
Cited
US1916208A
Cited
US2245661A
Cited
US2388892A
Cited
US2614744A
Cited
US2957542A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-30 | 1967-12-30 | 1968-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-30 | 1971-12-30 | 1972-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-30 | 1975-12-30 | 1976-06-30 | $7700.00 | Window Closed / Lapsed |