Patent US3216912A successfully refreshed from Google Patents.
US3216912A
Expired / Lapsed
US
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Method of treating matte tin plate to prevent darkening
Assignee: United States Steel Corp
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Filing: 1961-09-05
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Granted: 1965-11-09
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Expires: 1981-09-05
Abstract
No abstract record available.
Inventors
- 👤 Tom L Shoemaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:26
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/28; C23; C23C; C23C2/00; C23C2/04; C23C2/08; C25D11/38; C25D5/00; C25D5/48; C25D5/50; Y; Y10; Y10S; Y10S205/00; Y10S205/917
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1435260A
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US2503217A
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US2450509A
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US2606866A
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GB729914A
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US2974091A
Cited
US3062725A
Cited
US3087871A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |