US3608163A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for production of prestressed molded concrete members
Assignee: J H POMEROY AND CO Inc
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Filing: 1969-07-07
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Granted: 1971-09-28
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Expires: 1989-07-07
Abstract
Abstract IN THE MANUFACTURE OF PRE-STRESSED MOLDED CONCRETE MEMBERS A LIFTING MACHINE CHARACTERIZED BY A LATERALLY EXTENDING RIGID BAR AT EACH END WHICH CAN BE LOWERED INTO ENGAGEMENT WITH THE PROJECTING STUBS OF THE CABLE ENDS EXTENDING OUT OF THE MOLDED MEMBER. THE MEANS FOR ELEVATING THESE TWO TRANSVERSELY EXTENDING RIGID BARS SERVES FIRST TO ELIMINATE ALL SLACK FROM THE HOISTING MEANS COUPLED TO THE BARS. THEREAFTER, THE BARS ARE ELEVATED EVENLY SO AS NOT TO INTRODUCE A TWISTING MOMENT TO THE MOLDS OR MEMBERS.
Inventors
- 👤 Jon W Harford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:39
CPC Classifications
B; B28; B28B; B28B13/00; B28B13/04; B28B13/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |