Patent US1343902A successfully refreshed from Google Patents.
US1343902A
Expired / Lapsed
US
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Weli-sinking apparatus
Assignee: American Well Works
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Filing: 1918-06-10
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Granted: 1920-06-22
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Expires: 1938-06-10
Abstract
No abstract record available.
Inventors
- 👤 Matthew T Chapman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:59
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/16; E21B10/00; E21B10/44; E21B10/60
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) | 1923-06-22 | 1923-12-22 | 1924-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1927-06-22 | 1927-12-22 | 1928-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1931-06-22 | 1931-12-22 | 1932-06-22 | $7700.00 | Window Closed / Lapsed |