US3288247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety stepladder
Assignee: Individual
•
Filing: 1965-07-26
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Granted: 1966-11-29
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Expires: 1985-07-26
Abstract
No abstract record available.
Inventors
- 👤 Albert K Barnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:10
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/02; E06C1/38; E06C1/14; E06C1/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
225 words
A SAFETY STEPLADDER, COMPRISING: A FRONT STEPLADDER PORTION, A REAR STEPLADDER PORTION, A TOP STEP AND PLATFORM MEMBER PROVIDING THEREUNDER HINGE MEANS EFFECTIVELY HINGEDLY CONNECTED TO THE TOP OF SAID FRONT STEPLADDER PORTION AND TO THE TOP OF SAID STEPLADDER PORTION FOR HINGEDLY MOUNTING SAID FRONT AND REAR STEPLADDER PORTIONS WITH RESPECT TO EACH OTHER AND WITH RESPECT TO SAID TOP STEP AND PLATFORM MEMBER; CONTROLLABLY VERTICALLY EXTENDABLE AND RETRACTIBLE AUXILIARY SUPPORT MEANS HAVING A LOWER PORTION PROVIDED WITH MOUNTING MEANS EFFECTIVELY MOUNTING SAME WITH RESPECT TO SAID FRONT AND REAR STEPLADDER PORTIONS AND HAVING AN UPPER PORTION VERTICALLY SLIDABLY ENGAGED WITH RESPECT TO SAID LOWER PORTION FOR CONTROLLABLE UPWARD EXTENSION AND DOWNWARD RETRACTION RELATIVE THERETO AND RELATIVE TO SAID TOP STEP AND PLATFORM MEMBER; AND CONTROLLABLY MANUALLY OPERABLE LOCKING MEANS EFFECTIVELY COOPERABLE WITH RESPECT TO SAID VERTICALLY SLIDABLE UPPER PORTION OF SAID AUXILIARY SUPPORT MEANS FOR CONTROLLABLY AND POSITIVELY LOCKING, IN A STRUCTURALLY STRONG MANNER, SAID UPPER PORTION OF SAID AUXILIARY SUPPORT MEANS IN A DESIRED VERTICALLY EXTENDED POSITION WHEREBY TO PROVIDE A STABLE AND STRONG TYPE OF AUXILIARY SUPPORT FOR MANUAL GRASPING BY A PERSON STANDING ON THE SAFETY STEPLADDER, SAID MOUNTING MEANS FOR MOUNTING SAID LOWER PORTION OF SAID AUXILIARY SUPPORT MEANS WITH RESPECT TO SAID FRONT AND REAR STEPLADDER PORTIONS COMPRISING LOWER PIVOTAL LINKAGE MEANS HAVING A CENTER CLAMP RIGIDLY CON-
Claim 2
Dependent Claim
225 words
A SAFETY STEPLADDER, COMPRISING: A FRONT STEPLADDER PORTION, A REAR STEPLADDER PORTION, A TOP STEP AND PLATFORM MEMBER PROVIDING THEREUNDER HINGE MEANS EFFECTIVELY HINGEDLY CONNECTED TO THE TOP OF SAID FRONT STEPLADDER PORTION AND TO THE TOP OF SAID STEPLADDER PORTION FOR HINGEDLY MOUNTING SAID FRONT AND REAR STEPLADDER PORTIONS WITH RESPECT TO EACH OTHER AND WITH RESPECT TO SAID TOP STEP AND PLATFORM MEMBER; CONTROLLABLY VERTICALLY EXTENDABLE AND RETRACTIBLE AUXILIARY SUPPORT MEANS HAVING A LOWER PORTION PROVIDED WITH MOUNTING MEANS EFFECTIVELY MOUNTING SAME WITH RESPECT TO SAID FRONT AND REAR STEPLADDER PORTIONS AND HAVING AN UPPER PORTION VERTICALLY SLIDABLY ENGAGED WITH RESPECT TO SAID LOWER PORTION FOR CONTROLLABLE UPWARD EXTENSION AND DOWNWARD RETRACTION RELATIVE THERETO AND RELATIVE TO SAID TOP STEP AND PLATFORM MEMBER; AND CONTROLLABLY MANUALLY OPERABLE LOCKING MEANS EFFECTIVELY COOPERABLE WITH RESPECT TO SAID VERTICALLY SLIDABLE UPPER PORTION OF SAID AUXILIARY SUPPORT MEANS FOR CONTROLLABLY AND POSITIVELY LOCKING, IN A STRUCTURALLY STRONG MANNER, SAID UPPER PORTION OF SAID AUXILIARY SUPPORT MEANS IN A DESIRED VERTICALLY EXTENDED POSITION WHEREBY TO PROVIDE A STABLE AND STRONG TYPE OF AUXILIARY SUPPORT FOR MANUAL GRASPING BY A PERSON STANDING ON THE SAFETY STEPLADDER, SAID MOUNTING MEANS FOR MOUNTING SAID LOWER PORTION OF SAID AUXILIARY SUPPORT MEANS WITH RESPECT TO SAID FRONT AND REAR STEPLADDER PORTIONS COMPRISING LOWER PIVOTAL LINKAGE MEANS HAVING A CENTER CLAMP RIGIDLY CON-
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) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |