Patent US3389521A successfully refreshed from Google Patents.
US3389521A
Expired / Lapsed
US
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Concrete form structure for floors
Assignee: Individual
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Filing: 1966-08-03
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Granted: 1968-06-25
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Expires: 1986-08-03
Abstract
No abstract record available.
Inventors
- 👤 Werner K H Gregori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:45
CPC Classifications
E; E04; E04B; E04B5/00; E04B5/16; E04B5/17; E04B5/18; E04B5/21; E04B5/32; E04B5/36; E04B5/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A PREASSEMBLED CONCRETE FORM STRUCTURE FOR USE IN THE CONSTRUCTION OF A CONCRETE FLOOR AND INTENDED TO BE LEFT WITHIN THE POURED FLOOR AND TO PROVIDE A FINISHED CEILING SURFACE FOR THE UNDER SIDE OF THE POURED FLOOR, SAID STRUCTURE COMPRISING A PANEL ELEMENT OF A MATERIAL SUITABLE AS A FINISHED CEILING SURFACE AND CARRYING ON ITS TOP FACE AT LEAST ONE SEMI-TUBULAR MEMBER OF A RIGID MATERIAL, SAID SEMI-TUBULAR MEMBER HAVING ITS CONVEX SURFACE FACING UPWARDLY AND ITS LOWER EDGES ADHESIVELY FIXED TO SAID TOP FACE OF SAID PANEL ELEMENT, AND A LAYER OF INSULATING MATERIAL OVERLYING AND ADHESIVELY FIXED TO SAID PANEL ELEMENT AROUND SAID SEMI-TUBULAR ELEMENT, SAID
Claim 2
Dependent Claim
110 words
A PREASSEMBLED CONCRETE FORM STRUCTURE FOR USE IN THE CONSTRUCTION OF A CONCRETE FLOOR AND INTENDED TO BE LEFT WITHIN THE POURED FLOOR AND TO PROVIDE A FINISHED CEILING SURFACE FOR THE UNDER SIDE OF THE POURED FLOOR, SAID STRUCTURE COMPRISING A PANEL ELEMENT OF A MATERIAL SUITABLE AS A FINISHED CEILING SURFACE AND CARRYING ON ITS TOP FACE AT LEAST ONE SEMI-TUBULAR MEMBER OF A RIGID MATERIAL, SAID SEMI-TUBULAR MEMBER HAVING ITS CONVEX SURFACE FACING UPWARDLY AND ITS LOWER EDGES ADHESIVELY FIXED TO SAID TOP FACE OF SAID PANEL ELEMENT, AND A LAYER OF INSULATING MATERIAL OVERLYING AND ADHESIVELY FIXED TO SAID PANEL ELEMENT AROUND SAID SEMI-TUBULAR ELEMENT, SAID
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) | 1971-06-25 | 1971-12-25 | 1972-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-25 | 1975-12-25 | 1976-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-25 | 1979-12-25 | 1980-06-25 | $7700.00 | Window Closed / Lapsed |