Patent US3477930A successfully refreshed from Google Patents.
US3477930A
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US
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Method and system for preventing electrolytic corrosion of pipes
Assignee: LUCILE WELLS CRITES
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Filing: 1965-12-02
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Granted: 1969-11-11
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Expires: 1985-12-02
Abstract
No abstract record available.
Inventors
- 👤 Virgil C Crites
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:30
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/02; C23F13/04; C23F13/06; F; F16; F16L; F16L58/00; F16L58/18; F16L58/187; C23F2213/00; C23F2213/20; C23F2213/21; C23F2213/30; C23F2213/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1608709A
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US1804078A
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US2076466A
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US2076422A
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US2762767A
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US2809699A
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US2910421A
Cited
US3220942A
Cited
US3347768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |