Patent US3556994A successfully refreshed from Google Patents.
US3556994A
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Metal working agents
Assignee: Hoechst AG
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Filing: 1968-07-11
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Granted: 1971-01-19
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Expires: 1988-07-11
Abstract
Abstract AGENTS IN AQUEOUS METAL-WORKING LIQUIDS HAVING CORROSION INHIBITING ACTION AND BEING WATER SOLUBLE OR WATER DISPERSIBLE SALTS OF INORGANIC OR ORGANIC BASES AND AND AN ACID HAVING THE GENERAL FORMULA R1-AR(-SO2-N(-R3)-R4-COOH)N-R2
Inventors
- 👤 Helmut Diery
- 👤 Siegbert Rittner
- 👤 Horst Lorke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:06
CPC Classifications
C; C07; C07C; C07C255/00; C10; C10M; C10M173/00; C10M173/02; C10M3/00; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/16; C23F11/164; C10M2201/00; C10M2201/02; C10M2219/00; C10M2219/04; C10M2219/044; C10M2219/08; C10M2219/082; C10M2219/086; C10M2219/087; C10M2219/089; C10M2221/00; C10N; C10N2030/00; C10N2030/12; C10N2040/00; C10N2040/20; C10N2040/22; C10N2040/24; C10N2040/241; C10N2040/242; C10N2040/243; C10N2040/244; C10N2040/245; C10N2040/246; C10N2040/247; C10N2050/00; C10N2050/01
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |