US3595947A
Expired / Lapsed
US
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Method of manufacturing structural elements
Assignee: FABRIEK VAN BOUWMATERIALEN LOE
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Filing: 1967-03-03
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Granted: 1971-07-27
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Expires: 1987-03-03
Abstract
Abstract A STRUCTURAL ELEMENT OF CELLULAR CONCRETE HAVING A SURFACE LAYER OF CONCRETE IS FORMED BY FIRST MOLDING A CONCRETE BODY HAVING A CELLULAR-FORMING SBUSTANCE, HARDENING THE CELLULAR BODY FORMED THEREFROM, APPLYING AN OUTER LAYER OF CONCRETE MATERIAL OF SUBSTANTIALLY THE SAME COMPONENTS AS THE CELLULAR CONCRETE BODY BUT WITHOUT THE CELLULAR-FORMING SUBSTANCE, AND THEN SUBJECTING THE BODY TO THE ACTION OF STEAM UNDER SUPERATMOSPHERIC PRESSURE, WHEREBY TO HARDEN SAID LAYER.
Inventors
- 👤 Pieter Simon Wielinga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:33
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; B; B28; B28B; B28B1/00; B28B1/50; B28B19/00; B28B19/0015; C04B24/00; C04B24/24; C04B24/38; C04B24/383; C04B28/00; C04B28/02; C04B41/45; C04B41/50; C04B41/5076; C04B41/5088; C04B41/60; C04B41/61; C04B41/65; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/24421; Y10T428/2443; Y10T428/249921; Y10T428/249953; Y10T428/249967; Y10T428/249968; Y10T428/249987; Y10T428/249988
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |