US3418222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum anodizing method
Assignee: Murdock Inc
•
Filing: 1966-02-28
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Granted: 1968-12-24
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Expires: 1986-02-28
Abstract
No abstract record available.
Inventors
- 👤 Fred C Schaedel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:15
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/005; C25D11/024
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
IN A PROCESS FOR ANODIZING ALUMINUM WHEREIN THE PART TO BE ANODIZED IS PLACED IN AN ELECTROLYTE AND AN ELECTRIC CURRENT IS PASSED THROUGH THE PART AND ELECTROLYTE, THE STEP OF: APPLYING THE CURRENT IN PULSES; AND VARYING THE AMPLITUDE OF THE CURRENT PULSES AT A FREQUENCY ABOUT 1/60 PULSE RATE.
Claim 2
Dependent Claim
51 words
IN A PROCESS FOR ANODIZING ALUMINUM WHEREIN THE PART TO BE ANODIZED IS PLACED IN AN ELECTROLYTE AND AN ELECTRIC CURRENT IS PASSED THROUGH THE PART AND ELECTROLYTE, THE STEP OF: APPLYING THE CURRENT IN PULSES; AND VARYING THE AMPLITUDE OF THE CURRENT PULSES AT A FREQUENCY ABOUT 1/60 PULSE RATE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |