Patent US3249244A successfully refreshed from Google Patents.
US3249244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boom extension
Assignee: Case LLC
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Filing: 1964-09-17
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Granted: 1966-05-03
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Expires: 1984-09-17
Abstract
No abstract record available.
Inventors
- 👤 Jon J Ellerbroek
- 👤 Elton B Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:40
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/30; E02F3/301; E02F3/304; E02F3/32
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
100 words
IN A TRACTOR MOUNTED BACKHOE HAVING A BOOM NORMALLY CARRYING A DIPPER STICK PIVOTALLY MOUNTED AT ONE END THEREOF AND HAVING AN ACTUATING CYLINDER ANCHORED TO SAID BOOM AND A PISTON ROD PIVOTED TO SAID DIPPER STICK, THE IMPROVEMENTS OF A BOOM EXTENSION ELEMENT OF HOLLOW BOX-LIKE CONFIGURATION TELESCOPICALLY SLIDABLE OVER SAID BOOM, INTERENGAGING SLIDE MEANS ON SAID BOOM, SAID EXTENSION ACCOMMODATING RELATIVE TELESCOPIC BOOM-EXTENSION MOVEMENT, AN ANCHOR BRACKET ON SAID EXTENSION TO WHICH SAID CYLINDER IS ATTACHABLE, SAID EXTENSION HAVING A PAIR OF SPACED APERTURES SELECTIVELY REGISTRABLE WITH SAID ONE END OF SAID BOOM, AND MEANS SELECTIVELY INSERTABLE THROUGH
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) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |