Patent US2381774A successfully refreshed from Google Patents.
Patent US3385399A successfully refreshed from Google Patents.
US3385399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder and hanger frame assembly, and reversibility and portability features therein
Assignee: J DOUGLAS BURT
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Filing: 1966-07-27
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Granted: 1968-05-28
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Expires: 1986-07-27
Abstract
No abstract record available.
Inventors
- 👤 Burt J Douglas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:10
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/52; E06C1/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
FOR USE IN A LADDER OR THE LIKE, A FIRST PAIR OF SUSPENSION MEMBERS FOR SUPPORTING A LADDER RUNG ASSEMBLY AND HAVING A HOOKING REGION ON EACH OF SAID MEMBERS, A SECOND PAIR OF SUSPENSION MEMBERS FOR SUPPORTING A LADDER RUNG ASSEMBLY AND HAVING A HOOKING REGION ON EACH OF SAID MEMBERS, SAID FIRST AND SECOND PAIRS CONNECTED TOGETHER WHEREBY THEIR RESPECTIVE PLANES INTERSECT WITH EACH OTHER TO FORM AN ANGULAR RELATIONSHIP THEREBETWEEN, SAID HOOKING REGIONS LYING WITHIN THE CONFINES OF THE ANGULAR RELATIONSHIP OF SAID PAIRS, EACH PAIR OF MEMBERS HAVING AN EFFECTIVE LENGTH DIFFERENT THAN THE EFFECTIVE LENGTH OF THE OTHER PAIR OF MEMBERS WHEREBY SAID
Claim 2
Dependent Claim
108 words
FOR USE IN A LADDER OR THE LIKE, A FIRST PAIR OF SUSPENSION MEMBERS FOR SUPPORTING A LADDER RUNG ASSEMBLY AND HAVING A HOOKING REGION ON EACH OF SAID MEMBERS, A SECOND PAIR OF SUSPENSION MEMBERS FOR SUPPORTING A LADDER RUNG ASSEMBLY AND HAVING A HOOKING REGION ON EACH OF SAID MEMBERS, SAID FIRST AND SECOND PAIRS CONNECTED TOGETHER WHEREBY THEIR RESPECTIVE PLANES INTERSECT WITH EACH OTHER TO FORM AN ANGULAR RELATIONSHIP THEREBETWEEN, SAID HOOKING REGIONS LYING WITHIN THE CONFINES OF THE ANGULAR RELATIONSHIP OF SAID PAIRS, EACH PAIR OF MEMBERS HAVING AN EFFECTIVE LENGTH DIFFERENT THAN THE EFFECTIVE LENGTH OF THE OTHER PAIR OF MEMBERS WHEREBY SAID
References Cited (Backward Citations)
US3307654A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-28 | 1971-11-27 | 1972-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-28 | 1975-11-27 | 1976-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-28 | 1979-11-27 | 1980-05-28 | $7700.00 | Window Closed / Lapsed |