Patent US3390865A successfully refreshed from Google Patents.
US3390865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety fences
Assignee: National Research Development Corp UK
•
Filing: 1966-06-17
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Granted: 1968-07-02
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Expires: 1986-06-17
Abstract
No abstract record available.
Inventors
- 👤 Jehu Victor James
- 👤 Leonard Charles Pearson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:04
CPC Classifications
E; E01; E01F; E01F7/00; E01F7/06; E01F15/00; E01F15/02; E01F15/04; E01F15/0407; E01F15/0423; E01F15/0461; E01F15/0476
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2062408A
Cited
US2091195A
Cited
US2196290A
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US2227958A
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US2228652A
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US3114303A
Cited
AT232030B
Cited
US3314658A
Cited
US3332666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-02 | 1972-01-01 | 1972-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-02 | 1976-01-01 | 1976-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-02 | 1980-01-01 | 1980-07-02 | $7700.00 | Window Closed / Lapsed |