US643278A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for hardening metals.
Assignee: WILLIAM A LORENZ
•
Filing: 1898-08-13
•
Granted: 1900-02-13
•
Expires: 1918-08-13
Abstract
No abstract record available.
Inventors
- 👤 Charles W Sponsel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:05
CPC Classifications
B; B08; B08B; B08B3/00; B08B3/02; B08B3/022
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1903-02-13 | 1903-08-15 | 1904-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1907-02-13 | 1907-08-15 | 1908-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1911-02-13 | 1911-08-15 | 1912-02-14 | $7700.00 | Window Closed / Lapsed |