US2956956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inhibitors for acid solutions employed in the surface treatment of metals
Assignee: Dehydag Deutsche Hydrierwerke GmbH
•
Filing: 1955-02-09
•
Granted: 1960-10-18
•
Expires: 1975-02-09
Abstract
No abstract record available.
Inventors
- 👤 Strauss Wennemar
- 👤 Kirstahler Alfred
- 👤 Gundel Wolfgang
- 👤 Willmund Wolf-Dieter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:31
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/38; C23F; C23F11/00; C23F11/08; C23G; C23G1/00; C23G1/02; C23G1/04; C23G1/06; C23G1/065; C25; C25D; C25D3/00; C25D3/02; C25D3/38; C25D5/00; C25D5/34
Claims Analysis
Total Claims: 0
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US1981109A
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US2600287A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |