Patent US3679445A successfully refreshed from Google Patents.
US3679445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low density concretes and their manufacture
Assignee: John Laing and Son Ltd
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Filing: 1969-08-25
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Granted: 1972-07-25
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Expires: 1989-08-25
Abstract
Abstract A PLASTIC CONCRETE OR MORTAR MIX INCLUDING AN INCORPORATED GAS SUCH AS ENTRAINED AIR, AND FROM ONE TO TEN GRAMS OF SHORT FIBRES PER POUND OF CEMENT UNIFORMLY DISTRIBUTED THROUGHOUT THE MIX.
Inventors
- 👤 Alan Colin Scott Howe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:49
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02
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 |