US2898220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing steamcured light-weight concrete with low shrinkage
Assignee: Casius Corp Ltd
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Filing: 1952-11-25
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Granted: 1959-08-04
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Expires: 1972-11-25
Abstract
No abstract record available.
Inventors
- 👤 Ulfstedt Leo Torsten
- 👤 Bengtsson Bengt Fredrik Jonny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:20
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/10
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) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |