US3418897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Artificial playing surface
Assignee: Robert Ar Humalainen
•
Filing: 1967-06-12
•
Granted: 1968-12-31
•
Expires: 1987-06-12
Abstract
No abstract record available.
Inventors
- 👤 Robert A R Humalainen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:04
CPC Classifications
E; E01; E01C; E01C13/00; E01C13/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1277936A
Cited
US1352733A
Cited
US1949063A
Cited
US1970959A
Cited
US2515847A
Cited
US3348847A
Cited
US3323802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-31 | 1972-07-01 | 1972-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-31 | 1976-07-01 | 1976-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-31 | 1980-07-01 | 1980-12-31 | $7700.00 | Window Closed / Lapsed |