US3230720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trench shoring device
Assignee: SIGMA ENGINEERING Corp
•
Filing: 1960-05-02
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Granted: 1966-01-25
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Expires: 1980-05-02
Abstract
No abstract record available.
Inventors
- 👤 Bennett Darien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:40
CPC Classifications
E; E02; E02D; E02D17/00; E02D17/06; E02D17/08; E02D17/083
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A TRENCH SHORING DEVICE COMPRISING A PAIR OF ELONGATED PADS DISPOSED IN OPPOSED UPRIGHT PARALLELISM HAVING OUTER SURFACES ADAPTED TO ENGAGE THE WALLS OF A TRENCH AND HAVING THEIR INNER SURFACES DISPOSED IN OPPOSITELY FACING UNOBSTRUCTED RELATION AND EACH OF SAID INNER SURFACES BEING PROVIDED WITH A PAIR OF SPACED APART REINFORCING FLANGES, A PAIR OF EXPANDABLE BRACES EACH HAVING ITS OPPOSITE ENDS CONNECTED TO SAID FLANGES TO FORM WITH THE PADS A FRAME OF GENERALLY QUADRILATERAL SHAPE IN SIDE ELEVATION, SAID CONNECTIONS BEING PIVOTAL AND PROVIDING FOR A SUBSTANTIAL RANGE OF FREE SWINGING MOVEMENT OF ONE OF SAID PADS AND SAID BRACES FROM A COLLAPSED CONDITION OF
Claim 2
Dependent Claim
108 words
A TRENCH SHORING DEVICE COMPRISING A PAIR OF ELONGATED PADS DISPOSED IN OPPOSED UPRIGHT PARALLELISM HAVING OUTER SURFACES ADAPTED TO ENGAGE THE WALLS OF A TRENCH AND HAVING THEIR INNER SURFACES DISPOSED IN OPPOSITELY FACING UNOBSTRUCTED RELATION AND EACH OF SAID INNER SURFACES BEING PROVIDED WITH A PAIR OF SPACED APART REINFORCING FLANGES, A PAIR OF EXPANDABLE BRACES EACH HAVING ITS OPPOSITE ENDS CONNECTED TO SAID FLANGES TO FORM WITH THE PADS A FRAME OF GENERALLY QUADRILATERAL SHAPE IN SIDE ELEVATION, SAID CONNECTIONS BEING PIVOTAL AND PROVIDING FOR A SUBSTANTIAL RANGE OF FREE SWINGING MOVEMENT OF ONE OF SAID PADS AND SAID BRACES FROM A COLLAPSED CONDITION OF
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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) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |