US1335209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the prevention of selective corrosion of tubes and machinery parts of copper or copper containing alloys
Assignee: Sulzer Escher Wyss GmbH
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Filing: 1919-06-07
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Granted: 1920-03-30
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Expires: 1939-06-07
Abstract
No abstract record available.
Inventors
- 👤 Wurstemberger Franz Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:03
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/18
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) | 1923-03-30 | 1923-09-29 | 1924-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1927-03-30 | 1927-09-29 | 1928-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1931-03-30 | 1931-09-29 | 1932-03-30 | $7700.00 | Window Closed / Lapsed |