US3171545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three section telescoping crane boom
Assignee: DROTT Manufacturing CORP
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Filing: 1962-12-03
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Granted: 1965-03-02
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Expires: 1982-12-03
Abstract
No abstract record available.
Inventors
- 👤 Sidney G Knight
- 👤 F V Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:21
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/62; B66C23/64; B66C23/70; B66C23/701; B66C23/705; B66C13/00; B66C13/18; B66C2700/00; B66C2700/06; B66C2700/062
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
IN A MOBILE CRANE, AN EXTENSIBLE BOOM COMPRISING A TUBULAR BASE SECTION, A TUBULAR INTERMEDIATE SECTION TELESCOPICALLY SLIDABLE IN THE BASE SECTION, AN END SECTION TELESCOPICALL SLIDABLE LENGTHWISE IN THE INTERMEDIATE SECTION, LATCH MEANS RELEASABLE HOLDING THE INTERMEDIATE AND END SECTIONS AGAINST RELATIVE SLIDING MOVEMENT, MEANS CARRIED BY THE BASE SECTION TO ENGAGE AND RELEASE THE LATCH MEANS WHEN THE INTERMEDIATE SECTION HAS REACHED SUBSTANTIALLY THE LIMIT OF ITS OUTWARD MOVEMENT IN THE BASE SECTION, AND POWER MEANS ENGAGING THE BASE AND END SECTIONS TO EXTEND AND RETRACT THE BOOM.
Claim 2
Dependent Claim
90 words
IN A MOBILE CRANE, AN EXTENSIBLE BOOM COMPRISING A TUBULAR BASE SECTION, A TUBULAR INTERMEDIATE SECTION TELESCOPICALLY SLIDABLE IN THE BASE SECTION, AN END SECTION TELESCOPICALL SLIDABLE LENGTHWISE IN THE INTERMEDIATE SECTION, LATCH MEANS RELEASABLE HOLDING THE INTERMEDIATE AND END SECTIONS AGAINST RELATIVE SLIDING MOVEMENT, MEANS CARRIED BY THE BASE SECTION TO ENGAGE AND RELEASE THE LATCH MEANS WHEN THE INTERMEDIATE SECTION HAS REACHED SUBSTANTIALLY THE LIMIT OF ITS OUTWARD MOVEMENT IN THE BASE SECTION, AND POWER MEANS ENGAGING THE BASE AND END SECTIONS TO EXTEND AND RETRACT THE BOOM.
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) | 1968-03-01 | 1968-08-31 | 1969-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-01 | 1972-08-31 | 1973-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-01 | 1976-08-31 | 1977-03-02 | $7700.00 | Window Closed / Lapsed |