Patent US3273931A successfully refreshed from Google Patents.
US3273931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lifting grab
Assignee: Caldwell Co Inc
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Filing: 1965-01-04
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Granted: 1966-09-20
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Expires: 1985-01-04
Abstract
No abstract record available.
Inventors
- 👤 Leslie M Caldwell
- 👤 John W Remington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:35
CPC Classifications
B; B66; B66F; B66F9/00; B66F9/06; B66F9/075; B66F9/12; B66F9/18; B66F9/184
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A LIFTING DEVICE COMPRISING, IN COMBINATION, A SUBSTANTIALLY HORIZONTAL ELONGATED SPREADER BAR, A PAIR OF BELL-CRANK LEVERS PIVOTALLY CONNECTED TO THE OPPOSITE ENDS THEREOF, EACH HAVING A SUBSTANTIALLY VERTICAL CLAMP PORTION AT ONE END AND A SUBSTANTIALLY HORIZONTAL ACTUATING PORTION AT THE OTHER END, GRAB PADS MOUNTED ON THE CLAMP PORTIONS FOR ENGAGMENT WITH DIAMETRICALLY OPPOSITE SIDES OF AN OBJECT TO BE LIFTED, THE ACTUATING PORTIONS OF SAID LEVERS EXTENDING SUBSTANTIALLY HORIZONTALLY INWARDLY TOWARD EACH OTHER OVER OPPOSITE ENDS OF SAID SPREADER BAR, A LIFTING BALE ABOVE AND IN SPACED RELATION TO SAID ACTUATING PORTIONS AND ADAPTED TO BE LIFTED, AND A PAIR OF UPRIGHT LINKS PIVOTALLY CONNECTED AT THEIR LOWER ENDS TO THE INNER ENDS OF SAID ACTUATING PORTIONS PIVOTALLY CONNECTED AT THEIR UPPER ENDS TO THE LIFTING BALE.
Claim 2
Dependent Claim
130 words
A LIFTING DEVICE COMPRISING, IN COMBINATION, A SUBSTANTIALLY HORIZONTAL ELONGATED SPREADER BAR, A PAIR OF BELL-CRANK LEVERS PIVOTALLY CONNECTED TO THE OPPOSITE ENDS THEREOF, EACH HAVING A SUBSTANTIALLY VERTICAL CLAMP PORTION AT ONE END AND A SUBSTANTIALLY HORIZONTAL ACTUATING PORTION AT THE OTHER END, GRAB PADS MOUNTED ON THE CLAMP PORTIONS FOR ENGAGMENT WITH DIAMETRICALLY OPPOSITE SIDES OF AN OBJECT TO BE LIFTED, THE ACTUATING PORTIONS OF SAID LEVERS EXTENDING SUBSTANTIALLY HORIZONTALLY INWARDLY TOWARD EACH OTHER OVER OPPOSITE ENDS OF SAID SPREADER BAR, A LIFTING BALE ABOVE AND IN SPACED RELATION TO SAID ACTUATING PORTIONS AND ADAPTED TO BE LIFTED, AND A PAIR OF UPRIGHT LINKS PIVOTALLY CONNECTED AT THEIR LOWER ENDS TO THE INNER ENDS OF SAID ACTUATING PORTIONS PIVOTALLY CONNECTED AT THEIR UPPER ENDS TO THE LIFTING BALE.
References Cited (Backward Citations)
US2924484A
Cited
US2874990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |