US2970392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strip subgrader for roads
Assignee: Individual
•
Filing: 1957-10-22
•
Granted: 1961-02-07
•
Expires: 1977-10-22
Abstract
No abstract record available.
Inventors
- 👤 Glen E Perkins
- 👤 George W Dale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:55
CPC Classifications
E; E02; E02F; E02F5/00; E02F5/02; E02F5/022; E02F3/00; E02F3/04; E02F3/76; E02F3/80; E02F3/84; E02F3/841; Y; Y10; Y10S; Y10S37/00; Y10S37/904; Y10S37/906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1744801A
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US1973830A
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US1936518A
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US2163662A
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US2163682A
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US2503408A
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US2678508A
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US2749630A
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US2725799A
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US2787846A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |