Patent US2793932A successfully refreshed from Google Patents.
US2793932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibiting
Assignee: W H & L D Betz
•
Filing: 1953-11-09
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Granted: 1957-05-28
•
Expires: 1973-11-09
Abstract
No abstract record available.
Inventors
- 👤 Kahler Harry Lewis
- 👤 Charles B George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:43
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/18; C23F11/185
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
THE METHOD OF PROTECTING IRON ANS STEEL IN AN INDUSTRIAL WATER SYSTEM, WHICH COMPRISES INTRODUCING INTO SOLUTION IN THE WATER OF THE SYSTEM FROM 0.1 TO 100 P.P.M. OF TRIVALENT CHROMIUM AND FROM 1 TO 10,000 P.P.M.
Claim 2
Independent Claim
37 words
THE METHOD OF PROTECTING IRON ANS STEEL IN AN INDUSTRIAL WATER SYSTEM, WHICH COMPRISES INTRODUCING INTO SOLUTION IN THE WATER OF THE SYSTEM FROM 0.1 TO 100 P.P.M. OF TRIVALENT CHROMIUM AND FROM 1 TO 10,000 P.P.M.
References Cited (Backward Citations)
GB331725A
Cited
FR821736A
Cited
FR835828A
Cited
US2391895A
Cited
US2520475A
Cited
US2483510A
Cited
US2559878A
Cited
US2559812A
Cited
US2606157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-27 | 1960-11-26 | 1961-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-27 | 1964-11-26 | 1965-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-27 | 1968-11-26 | 1969-05-28 | $7700.00 | Window Closed / Lapsed |