Patent US3577504A successfully refreshed from Google Patents.
US3577504A
Expired / Lapsed
US
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Method of manufacturing a girder with a web of reinforced and/or prestressed concrete
Assignee: Individual
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Filing: 1969-02-28
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Granted: 1971-05-04
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Expires: 1989-02-28
Abstract
Abstract A METHOD FOR MANUFACTURING A GIRDER WITH A THIN WEB IN REINFORCED OR PRESTRESSED CONCRETE, THE WEB THICKNESS BEING 2 CM. PLUS 6% OF THE WIDTH UP TO 50 CM. WIDTH AND 5 CM. PLUS 2.5% OF THE WIDTH THEREAFTER. SAID THIN WEB IS PREFABRICATED INDEPENDENTLY OF AT LEAST ONE FLANGE IN A HORIZONTAL FLAT MOULD. SAID FLANGES ARE THEREAFTER INTEGRATED WITH SAID THIN WEB.
Inventors
- 👤 Abraham Icchok Lipski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:47
CPC Classifications
B; B28; B28B; B28B23/00; B28B23/02; B28B23/22; B28B23/04; B28B23/046; B28B23/06; E; E04; E04C; E04C3/00; E04C3/02; E04C3/20; E04C3/205; E04C3/26
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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |