US3190371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jack structure for an earth boring machine
Assignee: Individual
•
Filing: 1961-12-22
•
Granted: 1965-06-22
•
Expires: 1981-12-22
Abstract
No abstract record available.
Inventors
- 👤 James W Maxwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:10
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/046; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1526; Y10T74/1553; Y10T74/1558; Y10T74/1577
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
140 words
IN COMBINATION WITH AN EARTH BORING MACHINE HAVING SUPPORTING RAILS, AND A CARRIAGE MOVABLY MOUNTED ON SAID RAILS, A BORING MEANS SECURED TO SAID CARRIAGE; A JACK MEANS INCLUDING A LEVER MEANS PIVOTALLY SECURED TO SAID CARRIAGE, GRIPPING MEANS NORMALLY ENGAGING SAID RAILS, AND CONNECTING MEANS PIVOTALLY CONNECTED TO BOTH SAID LEVER MEANS AND SAID GRIPPING MEANS TO CAUSE SAID GRIPPING MEANS TO GRIP SAID RAILS WHEN SAID LEVER IS MOVED IN ONE DIRECTION, AND TO RELEASE SAID RAILS WHEN SAID LEVER IS MOVED IN A SECOND DIRECTION, SAID GRIPPING MEANS BEING ADAPTED TO BE SELECTIVELY PIVOTALLY MOVABLE BETWEEN TWO OPERATIVE POSITIONS SO THAT WHILE IN ONE OF ITS OPERATIVE POSITIONS EACH GRIPPING MEANS WILL GRIP SAID RAILS WHEN SAID LEVER IS MOVED IN EACH DIRECTION AND TO RELEASE SAID RAILS WHEN SAID LEVER IS MOVED IN A SECOND DIRECTION.
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) | 1968-06-21 | 1968-12-21 | 1969-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-21 | 1972-12-21 | 1973-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-21 | 1976-12-21 | 1977-06-22 | $7700.00 | Window Closed / Lapsed |