Patent US2137298A successfully refreshed from Google Patents.
Patent US1603834A successfully refreshed from Google Patents.
US1603834A
Expired / Lapsed
US
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Well-cementing device
Assignee: Individual
•
Filing: 1925-12-21
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Granted: 1926-10-19
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Expires: 1945-12-21
Abstract
No abstract record available.
Inventors
- 👤 Boynton Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:11
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87917; Y10T137/88054
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) | 1929-10-18 | 1930-04-19 | 1930-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-10-18 | 1934-04-19 | 1934-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-10-18 | 1938-04-19 | 1938-10-19 | $7700.00 | Window Closed / Lapsed |