US3490741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cleaning metal surfaces with polycarboxylic acid complexing agents inhibited by ethyleneimines or polyethylenepolyamines containing divalent sulfur
Assignee: Dow Chemical Co
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Filing: 1966-09-15
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Granted: 1970-01-20
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Expires: 1986-09-15
Abstract
No abstract record available.
Inventors
- 👤 Fred N Teumac
- 👤 Lester W Harriman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:51
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/14; C23G1/16; C23G1/18; C23G1/24; C23G1/26
Claims Analysis
Total Claims: 0
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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) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |