Patent US2820016A successfully refreshed from Google Patents.
US2820016A
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Corrosion inhibiting composition and indicator therefor
Assignee: Shell Development Co
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Filing: 1954-06-30
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Granted: 1958-01-14
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Expires: 1974-06-30
Abstract
No abstract record available.
Inventors
- 👤 Philip J Raifsnider
- 👤 Wieland Rita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:23
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; C; C23; C23F; C23F11/00; C23F11/02; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S436/00; Y10S436/904; Y10T; Y10T436/00; Y10T436/17; Y10T436/173076
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
AN INDICATOR SOLUTION FOR THE DETERMINATION OF NITRITE COMPOUNDS ON PAPERS CONTAINING A VAPOR PHASE CORROSION INHIBITING NITRITE, COMPRISING THE FOLLOWING INGREDIENTS IN THE STATED PROPORTIONS:
Claim 2
Dependent Claim
26 words
AN INDICATOR SOLUTION FOR THE DETERMINATION OF NITRITE COMPOUNDS ON PAPERS CONTAINING A VAPOR PHASE CORROSION INHIBITING NITRITE, COMPRISING THE FOLLOWING INGREDIENTS IN THE STATED PROPORTIONS:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |