US3679539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lightweight building units
Assignee: Bayer AG
•
Filing: 1970-11-25
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Granted: 1972-07-25
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Expires: 1990-11-25
Abstract
Abstract LIGHTWEIGHT BUILDING UNITS, ESPECIALLY LIGHTWEIGHT SLABS OF SYNTHETIC RESIN RIGID FOAM HAVING A GRANULAR SURFACE WITH EXPOSED AGGREGATES WHICH IS SYNTHETIC RESIN-BONDED AND RESEMBLES WASHED CONCRETE. THE LIGHTWEIGHT BUILDING UNITS MAY BE OPTIONALLY FIBREREINFORCED AND/OR CONTAIN LIGHTWEIGHT FILLERS.
Inventors
- 👤 Hubert Gossens
- 👤 Jurgen Kammermeier
- 👤 Werner Kloker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:43
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/02; B29C44/12; E; E04; E04C; E04C2/00; E04C2/02; E04C2/10; E04C2/20; E04C2/205; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/24421; Y10T428/2443; Y10T428/249921; Y10T428/249953
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |