Patent US73540A successfully refreshed from Google Patents.
US73540A
Expired / Lapsed
US
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Improved processes foe peoducing oxygen and ohloeine
Assignee: —
•
Filing: —
•
Granted: 1868-01-21
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Expires: 1885-01-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:14
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/01; C01B7/03
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) | 1871-01-20 | 1871-07-22 | 1872-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1875-01-20 | 1875-07-22 | 1876-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1879-01-20 | 1879-07-22 | 1880-01-21 | $7700.00 | Window Closed / Lapsed |