Patent US3149391A successfully refreshed from Google Patents.
US3149391A
Expired / Lapsed
US
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Elevator spider
Assignee: Jackson Memorial Hospital
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Filing: 1957-05-27
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Granted: 1964-09-22
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Expires: 1977-05-27
Abstract
No abstract record available.
Inventors
- 👤 Clark S Boster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:58
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/02; E21B19/06; E21B19/07
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
159 words
A WELL PIPE SPIDER-ELEVATOR COMPRISING: A BODY HAVING MEANS THEREON FOR RELEASABLY ENGAGING ELEVATOR LINKS; SAID BODY ALSO HAVING A CENTRAL OPENING THERETHROUGH; A SLIP ASSEMBLY DISPOSED FOR VERTICAL MOVEMENT IN SAID OPENING AND INCLUDING SLIP ELEMENTS MOVABLE TOWARDS AND AWAY FROM THE AXIS OF THE OPENING; MEANS ON THE SLIP ELEMENTS AND THE BODY FOR CAMMING SAID SLIP ELEMENTS TOWARDS SAID AXIS UPON DOWNWARD MOVEMENT OF SAID SLIP ASSEMBLY; MEANS FOR ELEVATING SAID SLIPS; SAID SLIP ELEVATING MEANS INCLUDING A LEVER PIVOTALLY MOUNTED ON SAID BODY AND CONNECTED TO SAID SLIP ASSEMBLY; MEANS ENGAGEABLE WITH SAID LEVER FOR RELEASABLY RETAINING SAID SLIP ASSEMBLY IN AN ELEVATED POSITION; THE MEANS FOR RELEASABLY RETAINING SAID SLIP ASSEMBLY IN AN ELEVATED POSITION INCLUDING A PIN CARRIED BY SAID LEVER; A LATCH ELEMENT SHIFTABLY CARRIED BY SAID BODY AND MOVABLE INTO AND OUT OF LATCHING ENGAGEMENT WITH SAID PIN; AND MEANS FOR RELEASABLY LOCKING SAID LATCH ELEMENT IN ENGAGEMENT WITH SAID PIN.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-22 | 1968-03-23 | 1968-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-22 | 1972-03-23 | 1972-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-22 | 1976-03-23 | 1976-09-22 | $7700.00 | Window Closed / Lapsed |