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US497700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of manufacturing hydrogen gas
Assignee: —
•
Filing: —
•
Granted: 1893-05-16
•
Expires: 1910-05-16
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:47
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/02; C01B3/06; C01B3/20; C01B2203/00; C01B2203/02; C01B2203/0205; C01B2203/0227; C01B2203/0233
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) | 1896-05-15 | 1896-11-14 | 1897-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1900-05-16 | 1900-11-15 | 1901-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1904-05-16 | 1904-11-15 | 1905-05-17 | $7700.00 | Window Closed / Lapsed |