US3520707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water reducing and retarding admixtures for portland cement slurries
Assignee: Rayonier Inc
•
Filing: 1967-05-24
•
Granted: 1970-07-14
•
Expires: 1987-05-24
Abstract
No abstract record available.
Inventors
- 👤 John C Steinberg
- 👤 Kenneth R Gray
- 👤 John Kelvin Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:56
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/38; C04B24/383
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2418431A
Cited
GB562141A
Cited
US2690975A
Cited
US2823135A
Cited
US2860060A
Cited
US2927033A
Cited
US3332791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |