US2999432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Road surfaces
Assignee: Individual
•
Filing: 1956-09-25
•
Granted: 1961-09-12
•
Expires: 1976-09-25
Abstract
No abstract record available.
Inventors
- 👤 Carl F Ytterberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:33
CPC Classifications
E; E01; E01C; E01C7/00; E01C7/08; E01C7/35; E01C7/351; E01C19/00; E01C19/48; E01C19/4833; E01C19/484
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US939072A
Cited
US1371683A
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US1570794A
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US1646667A
Cited
US1567772A
Cited
US1682687A
Cited
US2042156A
Cited
US2197431A
Cited
US2277203A
Cited
US2564619A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-11 | 1965-03-13 | 1965-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-11 | 1969-03-13 | 1969-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-11 | 1973-03-13 | 1973-09-12 | $7700.00 | Window Closed / Lapsed |