Patent US3691003A successfully refreshed from Google Patents.
US3691003A
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US
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Building board
Assignee: JULIUS W ELISCHER
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Filing: 1970-11-23
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Granted: 1972-09-12
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Expires: 1990-11-23
Abstract
Abstract A SELF-SUPPORTING, LOAD BEARING BUILDING BOARD THAT IS RELATIVELY LIGHT IN WEIGHT AND ECONOMICAL TO MANUFACTURE AND USE. THE BOARD HAS MULTI-LAYERED CONSTRUCTION WITH A CENTRAL CORE OF RELATIVELY STRONG FORAMINOUS MATERIAL, INTERMEDIATE LAYERS OF A DIFFERENT MATERIAL MECHANICALLY BONDED TO THE OPPOSITE FACES OF THE CORE AND OUTER LAYERS OF FIBROUS MATERIAL BONDED TO THE INTERMEDIATE LAYERS. THE INTERMEDIATE LAYERS ARE CONSIDERABLY MORE DENSE THAN THE CORE MATERIAL AND HAVE SUFFICIENT COMPRESSION STRENGTH TO IMPART DIMENSIONAL STABILITY THERETO. THE OUTER LAYERS ARE IN TENSION AND INSURE A LASTING BOND BETWEEN THE INTERMEDIATE LAYERS AND CORE.
Inventors
- 👤 Julius W Elischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:57
CPC Classifications
B; B32; B32B; B32B13/00; B32B13/04; B28; B28B; B28B11/00; B28B11/04; B28B19/00; B28B19/003; B32B13/08; E; E04; E04C; E04C2/00; E04C2/02; E04C2/04; E04C2/043; E04C2/049; B32B2607/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24959; Y10T428/24967; Y10T428/249921; Y10T428/249953; Y10T428/249955; Y10T428/249956; Y10T428/249957; Y10T428/249967; Y10T428/249968; Y10T428/26; Y10T428/266; Y10T428/31504; Y10T428/31971; Y10T428/31993; Y10T428/31996
Claims Analysis
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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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |