US3021235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal cleaning process
Assignee: EIDP Inc
•
Filing: 1957-06-04
•
Granted: 1962-02-13
•
Expires: 1977-06-04
Abstract
No abstract record available.
Inventors
- 👤 Frederick G Schumacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:29
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; D; D06; D06F; D06F43/00; D06F43/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US448895A
Cited
GB400613A
Cited
US2022201A
Cited
US2270642A
Cited
US2273939A
Cited
US2310569A
Cited
US2689198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-12 | 1965-08-14 | 1966-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-12 | 1969-08-14 | 1970-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-12 | 1973-08-14 | 1974-02-13 | $7700.00 | Window Closed / Lapsed |