Patent US2728652A successfully refreshed from Google Patents.
US2728652A
Expired / Lapsed
US
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Corrosion inhibitor composition
Assignee: HAWAIIAN DEV CO Ltd
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Filing: 1952-11-10
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Granted: 1955-12-27
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Expires: 1972-11-10
Abstract
No abstract record available.
Inventors
- 👤 Francis E Hance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:28
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/18; C23F11/187; C23F11/188
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
A CORROSION INHIBITOR COMPOSITION COMPRISING: SODIUM TRIPOLYPHOSPHATE, AND SODIUM CHROMATE.
Claim 2
Dependent Claim
10 words
A CORROSION INHIBITOR COMPOSITION COMPRISING: SODIUM TRIPOLYPHOSPHATE, AND SODIUM CHROMATE.
References Cited (Backward Citations)
US2554972A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |