Patent US87372A successfully refreshed from Google Patents.
US87372A
Expired / Lapsed
US
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Improvement in blasting- in oil-wells
Assignee: —
•
Filing: —
•
Granted: 1869-03-02
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Expires: 1886-03-02
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:07
CPC Classifications
F; F42; F42B; F42B3/00; E; E21; E21B; E21B7/00; E21B7/007
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) | 1872-03-01 | 1872-08-31 | 1873-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1876-03-01 | 1876-08-31 | 1877-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1880-03-01 | 1880-08-31 | 1881-03-02 | $7700.00 | Window Closed / Lapsed |