US3341445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anodization control circuits
Assignee: AT&T Inc
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Filing: 1964-09-01
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Granted: 1967-09-12
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Expires: 1984-09-01
Abstract
No abstract record available.
Inventors
- 👤 Allen R Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:11
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/22; H01C17/26; H01C17/262; C; C25; C25D; C25D21/00; C25D21/12; G; G01; G01R; G01R27/00; G01R27/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A CIRCUIT FOR ANODIZING A METAL OBJECT IN AN ELECTROLYTIC ANODIZING CELL TO INCREASE THE RESISTANCE OF THE OBJECT TO A DESIRED VALUE, WHICH COMPRISES: AN A.C. SOURCE; MEANS FOR CONNECTING THE A.C. SOURCE TO THE CELL SUCH THAT DURING ONE-HALF OF A CYCLE, THE SOURCE SUPPLIERS ANODIZING CURRENT TO THE CELL TO ANODIZE THE OBJECT AND THEREBY PROGRESSIVELY INCREASE ITS RESISTANCE AND, DURING THE OTHER HALF OF A CYCLE THE SOURCE SUPPLIES TESTING CURRENT TO THE OBJECT TO TEST THE RESISTANCE THEREOF; A DETECTOR, RESPONSIVE TO THE VOLTAGE DROP ACROSS THE OBJECT RESULTING FROM THE PASSING THERETHROUGH OF THE TEST CURRENT, FOR DETECTING WHEN THE OBJECT HAS REACHED ITS DESIRED RESISTANCE VALUE; AND MEANS FOR CONNECTING THE DETECTOR TO THE OBJECT SUCH THAT THE DETECTOR IS OPERABLE ONLY DURING THE HALF CYCLE WHEN TEST CURRENT IS FLOWING THROUGH THE OBJECT.
Claim 2
Dependent Claim
141 words
A CIRCUIT FOR ANODIZING A METAL OBJECT IN AN ELECTROLYTIC ANODIZING CELL TO INCREASE THE RESISTANCE OF THE OBJECT TO A DESIRED VALUE, WHICH COMPRISES: AN A.C. SOURCE; MEANS FOR CONNECTING THE A.C. SOURCE TO THE CELL SUCH THAT DURING ONE-HALF OF A CYCLE, THE SOURCE SUPPLIERS ANODIZING CURRENT TO THE CELL TO ANODIZE THE OBJECT AND THEREBY PROGRESSIVELY INCREASE ITS RESISTANCE AND, DURING THE OTHER HALF OF A CYCLE THE SOURCE SUPPLIES TESTING CURRENT TO THE OBJECT TO TEST THE RESISTANCE THEREOF; A DETECTOR, RESPONSIVE TO THE VOLTAGE DROP ACROSS THE OBJECT RESULTING FROM THE PASSING THERETHROUGH OF THE TEST CURRENT, FOR DETECTING WHEN THE OBJECT HAS REACHED ITS DESIRED RESISTANCE VALUE; AND MEANS FOR CONNECTING THE DETECTOR TO THE OBJECT SUCH THAT THE DETECTOR IS OPERABLE ONLY DURING THE HALF CYCLE WHEN TEST CURRENT IS FLOWING THROUGH THE OBJECT.
References Cited (Backward Citations)
US3196094A
Cited
US3282821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-11 | 1971-03-13 | 1971-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-11 | 1975-03-13 | 1975-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-11 | 1979-03-13 | 1979-09-12 | $7700.00 | Window Closed / Lapsed |