Patent US2431728A successfully refreshed from Google Patents.
US2431728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of ferrous metals to improve resistance to rusting
Assignee: DESPO Manufacturing CO Ltd
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Filing: 1944-02-17
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Granted: 1947-12-02
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Expires: 1964-02-17
Abstract
No abstract record available.
Inventors
- 👤 Bergstein Gerson Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:35
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/60; C23C22/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB336854A
Cited
GB335868A
Cited
US1924311A
Cited
US2077450A
Cited
GB464656A
Cited
US2148331A
Cited
US2154607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-01 | 1951-06-02 | 1951-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-01 | 1955-06-02 | 1955-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-01 | 1959-06-02 | 1959-12-02 | $7700.00 | Window Closed / Lapsed |