US3308967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extensible boom crane
Assignee: Individual
•
Filing: 1965-10-06
•
Granted: 1967-03-14
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Expires: 1985-10-06
Abstract
No abstract record available.
Inventors
- 👤 Byron F Barkley
- 👤 William H Kibbie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:08
CPC Classifications
B; B66; B66F; B66F11/00; B66F11/04; B66F11/044; B66F11/046
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
184 words
AN EXTENSIBLE BOOM CRANE COMPRISING IN COMBINATION: A SUPPORTING BASE; AN EXTENSIBLE BOOM PIVOTALLY MOUNTED ON SAID BASE SO THAT IT CAN BE RAISED AND LOWERED, SAID BOOM HAVING A PLURALITY OF BOOM SECTIONS INTERFITTED FOR LONGITUDINAL EXTENSION AND RETRACTION TO LENGTHEN AND SHORTEN THE BOOM, WITH THE SECTION EXTENSIBLE THE GREATEST DISTANCE FROM THE SUPPORTING BASE COMPRISING A TIP SECTION AND A SECTION CONNECTED TO THE SUPPORTING BASE COMPRISING A BASE SECTION; MEANS FOR RAISING AND LOWERING THE BOOM AND FOR HOLDING IT AT ANY GIVEN ANGULAR RELATIONSHIP WITH THE HORIZONTAL DURING USE; A NORMALLY UPRIGHT GANTRY MAST PIVTED TO THE BOOM ADJACENT TO SAID BASE; AT LEAST ONE DRIVE WHEEL MOUNTED ON SAID BASE; RIGGING FOR EXTENDING AND RETRACTING SAID BOOM WITHOUT ALTERING ITS SAID ANGULAR RELATIONSHIP WITH THE HORIZONTAL, SAID RIGGING INCLUDING AT LEAST ONE SYSTEM OF PULLEYS SECURED TO THE RESPECTIVE BOOM SECTIONS AND A SINGLE CABLE FOR EACH SAID SYSTEM OF PULLEYS, THE PULLEYS OF EACH SAID SYSTEM BEING ARRANGED AND ITS CABLE BEING WRAPPED AROUND THEM TO EXTEND THE BOOM SECTIONS WHEN THE CABLE IS PULLED AND TO
Claim 2
Dependent Claim
184 words
AN EXTENSIBLE BOOM CRANE COMPRISING IN COMBINATION: A SUPPORTING BASE; AN EXTENSIBLE BOOM PIVOTALLY MOUNTED ON SAID BASE SO THAT IT CAN BE RAISED AND LOWERED, SAID BOOM HAVING A PLURALITY OF BOOM SECTIONS INTERFITTED FOR LONGITUDINAL EXTENSION AND RETRACTION TO LENGTHEN AND SHORTEN THE BOOM, WITH THE SECTION EXTENSIBLE THE GREATEST DISTANCE FROM THE SUPPORTING BASE COMPRISING A TIP SECTION AND A SECTION CONNECTED TO THE SUPPORTING BASE COMPRISING A BASE SECTION; MEANS FOR RAISING AND LOWERING THE BOOM AND FOR HOLDING IT AT ANY GIVEN ANGULAR RELATIONSHIP WITH THE HORIZONTAL DURING USE; A NORMALLY UPRIGHT GANTRY MAST PIVTED TO THE BOOM ADJACENT TO SAID BASE; AT LEAST ONE DRIVE WHEEL MOUNTED ON SAID BASE; RIGGING FOR EXTENDING AND RETRACTING SAID BOOM WITHOUT ALTERING ITS SAID ANGULAR RELATIONSHIP WITH THE HORIZONTAL, SAID RIGGING INCLUDING AT LEAST ONE SYSTEM OF PULLEYS SECURED TO THE RESPECTIVE BOOM SECTIONS AND A SINGLE CABLE FOR EACH SAID SYSTEM OF PULLEYS, THE PULLEYS OF EACH SAID SYSTEM BEING ARRANGED AND ITS CABLE BEING WRAPPED AROUND THEM TO EXTEND THE BOOM SECTIONS WHEN THE CABLE IS PULLED AND TO
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) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |