US1247863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Art of cementation and hardening of metallic objects.
Assignee: Individual
•
Filing: 1917-03-03
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Granted: 1917-11-27
•
Expires: 1937-03-03
Abstract
No abstract record available.
Inventors
- 👤 Heinrich Nettgens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:31
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/20; C23C8/22
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) | 1920-11-26 | 1921-05-28 | 1921-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1924-11-26 | 1925-05-28 | 1925-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1928-11-26 | 1929-05-28 | 1929-11-27 | $7700.00 | Window Closed / Lapsed |