US3661604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-weight concrete material and process for producing the same
Assignee: Individual
•
Filing: 1969-08-12
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Granted: 1972-05-09
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Expires: 1989-08-12
Abstract
Abstract A light-weight concrete having a density of 800 - 1,800 kg/m3 consists essentially of a coarse aggregate, a fine aggregate, cement, and water, the coarse aggregate being at least 50 percent of all solids by volume, the fine aggregates being constituted by fine said of less than 1 mm grain size, crushed mineral material such as crushed brick of less than 5 mm grain size and pulverized mineral material, such as powdered brick of a grain size of less than 2 mm.
Inventors
- 👤 Paul Artmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:58
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B20/00; C04B20/0076; E; E04; E04B; E04B1/00; E04B1/02; E04B1/04; E04H; E04H1/00; E04H1/005; C04B2111/00; C04B2111/40; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 0
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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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |