US1379656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preventing caving in wells
Assignee: Individual
•
Filing: 1919-09-30
•
Granted: 1921-05-31
•
Expires: 1939-09-30
Abstract
No abstract record available.
Inventors
- 👤 John C Swan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:41
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C09K8/516
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1924-05-30 | 1924-11-29 | 1925-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-05-30 | 1928-11-29 | 1929-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-05-30 | 1932-11-29 | 1933-05-31 | $7700.00 | Window Closed / Lapsed |