Patent US3302348A successfully refreshed from Google Patents.
US3302348A
Expired / Lapsed
US
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Prestressed concrete joist and slab construction
Assignee: PERL TILE CO
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Filing: 1964-01-07
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Granted: 1967-02-07
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Expires: 1984-01-07
Abstract
No abstract record available.
Inventors
- 👤 Clarence A Pratt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:01
CPC Classifications
E; E04; E04C; E04C3/00; E04C3/02; E04C3/29; E04B; E04B1/00; E04B1/62; E04B1/92; E04B1/94; E04B1/941; E04B1/942; E04C3/20; E04C3/26; E04C5/00; E04C5/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
139 words
A COMPOSITE STRUCTURE COMPRISING: A CONCRETE JOIST, A PLURALITY OF PRESTRESSED STRANDS RUNNING LONGITUDINALLY THROUGH SAID JOIST, A PLURALITY OF MEMBERS ELONGATED LOOP-LIKE IN FORM OF ROD-LIKE MATERIAL DISPOSED TRANSVERSELY WITHIN SAID JOIST IN LONGITUDINALLY SPACED RELATION ENCLOSING SAID STRANDS, EACH OF SAID MEMBERS HAVING FREE LOWER END PORTIONS ARRANGED AND CONSTRUCTED FOR LOCKING ENGAGEMENT WITH SAID STRANDS, SAID LOWER FREE END PORTIONS BEING ADAPTED TO POSITON SAID MEMBERS IN PLANES NORMAL TO THE AXIS OF SAID STRAND, A PLURALITY OF ANCHOR MEMBERS INTEGRAL WITH SAID JOIST SPACED LONGITUDINALLY THEREOF AND PROJECTING UPWARDLY THEREOF, SLABS SUPPORTED ON SAID JOIST AT EITHER SIDE OF SAID ANCHOR MEMBER, MEANS ENGAGING AND TYING SAID ANCHOR MEMBERS AND SAID SLABS INTO A UNITARY STRUCTURE WITH SAID JOIST TO WITHSTAND TRANSVERSE LOAD FOR LATERAL STABILITY, SAID LOWER END PORTIONS BEING INCLINED TO INTERSECT ONE
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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) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |