US3447938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lightweight high-strength cement compositions
Assignee: V R B ASSOCIATES Inc
•
Filing: 1966-08-08
•
Granted: 1969-06-03
•
Expires: 1986-08-08
Abstract
No abstract record available.
Inventors
- 👤 Anatole N Vassilevsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:50
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/30; C04B28/32; C04B9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US396693A
Cited
US872375A
Cited
US2511904A
Cited
US757252A
Cited
US909171A
Cited
US1107357A
Cited
US1102358A
Cited
US1333510A
Cited
US1916971A
Cited
US2649160A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |