US3660077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for detinning tinned sheet iron
Assignee: Evonik Operations GmbH
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Filing: 1970-02-16
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Granted: 1972-05-02
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Expires: 1990-02-16
Abstract
Abstract This invention relates to a process of detinning tin-plated sheet iron with soda lye in the presence of sodium chlorite as an oxidizing agent.
Inventors
- 👤 Erich Ruf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:52
CPC Classifications
C; C22; C22B; C22B25/00; C22B25/06; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
A process according to claim 1 performed at a temperature in the range of about 50* to 200* C.
Claim 2
Dependent Claim
15 words
A process according to claim 2 in which air is passed through the reaction mixture.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |