US3568387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structural element
Assignee: Individual
•
Filing: 1969-05-07
•
Granted: 1971-03-09
•
Expires: 1989-05-07
Abstract
Abstract A STRUCTURAL ELEMENT WHICH IS PARTICULARLY SUITABLE FOR USE IN THE ERECTION OF WALL STRUCTURES. THE ELEMENT COMPRISES AT LEAST ONE BLOCK OF VITREOUS MATERIAL. THIS BLOCK HAS A FIRST AND A SECOND MAJOR SURFACE ANS AT LEAST ONE OF THESE MAJOR SURFACE IN AT LEAST IN PART INCLINED TO A CENTRAL PLANE OF THE BLOCK WHEREBY THE THUS-INCLINED PORTION HAS A PREDETERMINED RELATIONSHIP WITH THE CENTRAL PLANE OF THE BLOCK AS WELL AS WITH A GENERAL PLANE OF THE STRUCTURAL ELEMENT.
Inventors
- 👤 Gunter Grabow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:29
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/54; E04C2/546
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |