US3147571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concrete bridging beam form
Assignee: Bethlehem Steel Corp
•
Filing: 1959-03-20
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Granted: 1964-09-08
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Expires: 1979-03-20
Abstract
No abstract record available.
Inventors
- 👤 John C Welch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:51
CPC Classifications
E; E04; E04B; E04B5/00; E04B5/16; E04B5/17; E04B5/23; E04B5/29
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
72 words
IN A STEEL JOIST, AND CONCRETE SLAB STRUCTURE, A PLURALITY OF OPEN-WEB STEEL JOISTS, A PLURALITY OF OVERLAPPING SHEET METAL BEAM FORMS FOR CONCRETE BRIDGING THE SPACE BETWEEN SAID JOISTS, SAID FORMS EACH COMPRISING A SUBSTANTIALLY U-SHAPED CHANNEL, THE UPPER SIDE WALLS OF SAID CHANNEL BEING PROVIDED AT ONE END WITH BENDABLE NOTCHED FLAP PORTIONS, THE NOTCHES OF SAID FLAP PORTIONS BEING ADAPTED TO ACCOMMODATE THE UPPER CHORD MEMBERS OF SAID JOISTS.
References Cited (Backward Citations)
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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) | 1967-09-08 | 1968-03-09 | 1968-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-08 | 1972-03-09 | 1972-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-08 | 1976-03-09 | 1976-09-08 | $7700.00 | Window Closed / Lapsed |