Patent US2807777A successfully refreshed from Google Patents.
US2807777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coil assembly for geophysical prospecting
Assignee: Individual
•
Filing: 1945-05-24
•
Granted: 1957-09-24
•
Expires: 1965-05-24
Abstract
No abstract record available.
Inventors
- 👤 Doll Henri-Georges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:38
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/08; G01V3/10; G01V3/104; G01V3/108
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1499979A
Cited
US1679339A
Cited
US1627958A
Cited
US1812392A
Cited
US1871345A
Cited
US1910820A
Cited
US2220788A
Cited
US2220070A
Cited
US2129058A
Cited
US2160356A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |