US2965891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal converting systems
Assignee: Schlumberger Well Surveying Corp
•
Filing: 1955-06-21
•
Granted: 1960-12-20
•
Expires: 1975-06-21
Abstract
No abstract record available.
Inventors
- 👤 Gunther J Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:51
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/06; H03M1/0617
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2316044A
Cited
US2564017A
Cited
US2715678A
Cited
US2718634A
Cited
US2754503A
Cited
US2731631A
Cited
US2869115A
Cited
US2736889A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |