Patent US3334390A successfully refreshed from Google Patents.
US3334390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
End ring trowelling attachment for concrete pipe making apparatus
Assignee: Individual
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Filing: 1965-01-04
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Granted: 1967-08-08
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Expires: 1985-01-04
Abstract
No abstract record available.
Inventors
- 👤 Steiro Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:36
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/76; Y; Y10; Y10S; Y10S425/00; Y10S425/218
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
APPARATUS FOR MAKING CONCRETE PIPE FROM NO-SLUMP CONCRETE COMPRISING , A VERTICALLY POSITIONED TUBULAR OUTER MOLD AND AN INNER MOLD CONCENTRIC THEREWITH TO FORM AN ANNULAR SPACE BETWEEN SAID MOLDS INTO WHICH NO-SLUMP CONCRETE CAN BE POURED TO FORM A PIPE, A SEPARATE END RING ADAPTED TO BE POSITIONED INDEPENDENTLY OF AND BETWEEN THE UPPER ENDS OF SAID MOLDS SO AS TO HOLD THEM IN PROPER RADIALLY SPACED RELATIONSHIP, SAID RING BEING OF SUCH CROSS-SECTIONAL SHAPE SO AS TO FORM THE FINISHED TOP END OF SAID PIPE, AND POWER MEANS TO OSCILLATE SAID RING RELATIVE TO EACH OF SAID MOLDS AND ABOUT A VERTICAL AXIS EXTENDING CENTRALLY THROUGH SAID RING AND WHILE SAID RING IS BETWEEN SAID MOLDS TO THEREBY FORM AND TROWEL THE TOP END OF SAID PIPE.
Claim 2
Dependent Claim
129 words
APPARATUS FOR MAKING CONCRETE PIPE FROM NO-SLUMP CONCRETE COMPRISING , A VERTICALLY POSITIONED TUBULAR OUTER MOLD AND AN INNER MOLD CONCENTRIC THEREWITH TO FORM AN ANNULAR SPACE BETWEEN SAID MOLDS INTO WHICH NO-SLUMP CONCRETE CAN BE POURED TO FORM A PIPE, A SEPARATE END RING ADAPTED TO BE POSITIONED INDEPENDENTLY OF AND BETWEEN THE UPPER ENDS OF SAID MOLDS SO AS TO HOLD THEM IN PROPER RADIALLY SPACED RELATIONSHIP, SAID RING BEING OF SUCH CROSS-SECTIONAL SHAPE SO AS TO FORM THE FINISHED TOP END OF SAID PIPE, AND POWER MEANS TO OSCILLATE SAID RING RELATIVE TO EACH OF SAID MOLDS AND ABOUT A VERTICAL AXIS EXTENDING CENTRALLY THROUGH SAID RING AND WHILE SAID RING IS BETWEEN SAID MOLDS TO THEREBY FORM AND TROWEL THE TOP END OF SAID PIPE.
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) | 1970-08-07 | 1971-02-06 | 1971-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-07 | 1975-02-06 | 1975-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-07 | 1979-02-06 | 1979-08-08 | $7700.00 | Window Closed / Lapsed |