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Patent US3498455A successfully refreshed from Google Patents.
US3498455A
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Ditch magnet
Assignee: DITCH MAGNETS Inc
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Filing: 1968-01-19
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Granted: 1970-03-03
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Expires: 1988-01-19
Abstract
No abstract record available.
Inventors
- 👤 John H Kirby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:35
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/06; E21B21/063; E21B21/065; B; B03; B03C; B03C1/00; B03C1/02; B03C1/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB563022A
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US2699871A
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US2537710A
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US2636608A
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US2678729A
Cited
US2870990A
Cited
GB796336A
Cited
US2792115A
Cited
US2912106A
Cited
GB855929A
Cited
US3139403A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-02 | 1973-09-01 | 1974-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-02 | 1977-09-01 | 1978-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-02 | 1981-09-01 | 1982-03-03 | $7700.00 | Window Closed / Lapsed |