US2491225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of protecting subterranean metallic structures
Assignee: Individual
•
Filing: 1944-10-16
•
Granted: 1949-12-13
•
Expires: 1964-10-16
Abstract
No abstract record available.
Inventors
- 👤 Dick E Stearns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:24
CPC Classifications
H; H01; H01B; H01B13/00; H01B13/22; C; C23; C23F; C23F13/00; C23F13/02; F; F16; F16L; F16L58/00; F16L58/02; F16L58/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |