US653468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of rendering anthracite coal conductive, &c.
Assignee: HENRY A KAUFHOLD
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Filing: 1900-04-27
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Granted: 1900-07-10
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Expires: 1920-04-27
Abstract
No abstract record available.
Inventors
- 👤 William J Burke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:51
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/528; C04B35/532; B; B82; B82Y; B82Y30/00
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) | 1903-07-10 | 1904-01-09 | 1904-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1907-07-10 | 1908-01-09 | 1908-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1911-07-10 | 1912-01-09 | 1912-07-10 | $7700.00 | Window Closed / Lapsed |