US3573979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing flow-detecting granulated coloring magnetic particles
Assignee: Individual
•
Filing: 1968-05-08
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Granted: 1971-04-06
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Expires: 1988-05-08
Abstract
Abstract THE METHOD OF MANUFACTURING FLAW-DETECTING GRANULATED COLORED MAGNETIC PARTICLES COMPRISING THE STEPS OF ADDING IRON DUST, A COLORING AGENT, AND A BINDER TO A SOLVENT. THESE INGREDIENTS ARE BLENDED TO MAKE A MIXED LIQUID MATERIAL AND SAID MIXED LIQUID MATERIAL WITH A SEPARATION AGENT THEREIN IS SPRAYED WITH THE IRON DUST. THEN THE MIXED LIQUID MATERIAL IS SEPARATED INTO PARTICLES OF IRON DUST COATED WITH THE COLORING AGENT SO AS TO PRODUCE COLORED MAGNETIC PARTICLES.
Inventors
- 👤 Kazuo Honjo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:16
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/83; G01N27/84; H; H01; H01F; H01F1/00; H01F1/44; H01F1/442
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |