US3281344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colloidal suspension of ferromagnetic iron particles
Assignee: Chevron USA Inc
•
Filing: 1963-08-27
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Granted: 1966-10-25
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Expires: 1983-08-27
Abstract
No abstract record available.
Inventors
- 👤 John R Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:10
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/44; H01F1/442; G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
194 words
A METHOD OF PREPARING IRON PARTICLES WHICH ARE: (1) DISCETE, (2) DISPERSED IN AN ORGANIC MEDIUM, (3) OF A SIZE IN THE RANGE OF ABOUT 10 TO 1000 A., (4) EXISTING IN AN ORGANIZED LINEAR ARRANGEMENT, EACH UNIT HAVING AT LEAST 5 MEMBERS; WHICH COMPRISES: DECOMPOSING BY ELECTROMAGNETIC RADIATION IN A HOMOGENEOUS COMPOSITION, AN ORGANO-IRON COMPOUND, WHEREIN IRON HAS AT LEAST ONE COORDINATE BOND TO CARBON, WHICH IS PRESENT IN AN AMOUNT SUFFICIENT TO FORM A SUBSTANTIAL AMOUNT BY WEIGHT OF THE METAL AS PARTICLES OF AT LEAST 100 A., IN THE PRESENCE OF, AS A MAJOR COMPONENT, FROM 85 TO 100% BY WEIGHT OF THE TOTAL SOLVENT OF AN INERT SOLVENT OF DIELECTRIC CONSTANT OF FROM 1.7 TO 2.5 SELECTED FROM THE GROUP CONSISTING OF HYDROCARBONS AND INERT HALOHYDROCARBONS AND AS A MINOR COMPONENT FROM 0.5% BY WEIGHT OF THE TOTAL SOLVENT OF AN ORGANIC MATERIAL HAVING A CHALCOSEN OF ATOMIC NUMBER 8 THROUGH 16 AND SELECTED FROM THE GROUP CONSISTING OF ETHERS, KETONES, ESTERS, AND THEIR THIO ANALOGS, IN THE PRESENCE OF A FLEXIBLE POLYMER OF AT LEAST 10,000 MOLECULAR WEIGHT WHEREIN AT LEAST 85% OF THE MONOMERS HAVE THE FOLLOWING FORMULA:
Claim 2
Independent Claim
194 words
A METHOD OF PREPARING IRON PARTICLES WHICH ARE: (1) DISCETE, (2) DISPERSED IN AN ORGANIC MEDIUM, (3) OF A SIZE IN THE RANGE OF ABOUT 10 TO 1000 A., (4) EXISTING IN AN ORGANIZED LINEAR ARRANGEMENT, EACH UNIT HAVING AT LEAST 5 MEMBERS; WHICH COMPRISES: DECOMPOSING BY ELECTROMAGNETIC RADIATION IN A HOMOGENEOUS COMPOSITION, AN ORGANO-IRON COMPOUND, WHEREIN IRON HAS AT LEAST ONE COORDINATE BOND TO CARBON, WHICH IS PRESENT IN AN AMOUNT SUFFICIENT TO FORM A SUBSTANTIAL AMOUNT BY WEIGHT OF THE METAL AS PARTICLES OF AT LEAST 100 A., IN THE PRESENCE OF, AS A MAJOR COMPONENT, FROM 85 TO 100% BY WEIGHT OF THE TOTAL SOLVENT OF AN INERT SOLVENT OF DIELECTRIC CONSTANT OF FROM 1.7 TO 2.5 SELECTED FROM THE GROUP CONSISTING OF HYDROCARBONS AND INERT HALOHYDROCARBONS AND AS A MINOR COMPONENT FROM 0.5% BY WEIGHT OF THE TOTAL SOLVENT OF AN ORGANIC MATERIAL HAVING A CHALCOSEN OF ATOMIC NUMBER 8 THROUGH 16 AND SELECTED FROM THE GROUP CONSISTING OF ETHERS, KETONES, ESTERS, AND THEIR THIO ANALOGS, IN THE PRESENCE OF A FLEXIBLE POLYMER OF AT LEAST 10,000 MOLECULAR WEIGHT WHEREIN AT LEAST 85% OF THE MONOMERS HAVE THE FOLLOWING FORMULA:
References Cited (Backward Citations)
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US2900343A
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US2833723A
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US3014818A
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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) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |