Patent US432680A successfully refreshed from Google Patents.
Patent US1704427A successfully refreshed from Google Patents.
Patent US2943281A successfully refreshed from Google Patents.
Patent FR1273530A successfully refreshed from Google Patents.
Patent US1214949A successfully refreshed from Google Patents.
US1214949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine for hardening articles.
Assignee: Individual
•
Filing: 1913-05-16
•
Granted: 1917-02-06
•
Expires: 1933-05-16
Abstract
No abstract record available.
Inventors
- 👤 William J Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:20
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/62; C21D1/673
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) | 1920-02-06 | 1920-08-07 | 1921-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1924-02-06 | 1924-08-07 | 1925-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1928-02-06 | 1928-08-07 | 1929-02-06 | $7700.00 | Window Closed / Lapsed |