Patent US1555313A successfully refreshed from Google Patents.
US1555313A
Expired / Lapsed
US
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Process of melting and degasifying metals under reduced pressure
Assignee: Individual
•
Filing: 1920-03-06
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Granted: 1925-09-29
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Expires: 1940-03-06
Abstract
No abstract record available.
Inventors
- 👤 Rohn Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:46
CPC Classifications
C; C22; C22B; C22B9/00; C22B9/04
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) | 1928-09-28 | 1929-03-30 | 1929-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-09-28 | 1933-03-30 | 1933-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-09-28 | 1937-03-30 | 1937-09-29 | $7700.00 | Window Closed / Lapsed |