US2864771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making fluorescent paramagnetic pigments and product produced thereby
Assignee: JOHN D STEELE
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Filing: 1957-11-27
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Granted: 1958-12-16
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Expires: 1977-11-27
Abstract
No abstract record available.
Inventors
- 👤 Joseph L Switzer
- 👤 Robert C Switzer
- 👤 Richard A Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:10
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/06; C07; C07D; C07D215/00; C07D215/02; C07D215/16; C07D215/20; C07D215/24; C07D215/26; C07D215/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A POWDERED FLUORESCENT PARAMAGNETIC COMPOUND COMPRISING A FLUORESCENT INNER METALLIC COMPLEX OF A PHENOL OF THE GROUP CONSISTING OF 8-HYDROXYQUINOLINE AND DERIVATIVES THEREOF AT LEAST PARTIALLY ENVELOPING A SOLID POWDERED PARAMAGNETIC SUBSTRATA AS PRECIPITATE FORMATIONS CONDENSED DIRECTLY ON AND ABOUT SEPARATE PARTICLES OF SAID POWDERED SUBSTRATA.
Claim 2
Dependent Claim
46 words
A POWDERED FLUORESCENT PARAMAGNETIC COMPOUND COMPRISING A FLUORESCENT INNER METALLIC COMPLEX OF A PHENOL OF THE GROUP CONSISTING OF 8-HYDROXYQUINOLINE AND DERIVATIVES THEREOF AT LEAST PARTIALLY ENVELOPING A SOLID POWDERED PARAMAGNETIC SUBSTRATA AS PRECIPITATE FORMATIONS CONDENSED DIRECTLY ON AND ABOUT SEPARATE PARTICLES OF SAID POWDERED SUBSTRATA.
References Cited (Backward Citations)
DE292819C
Cited
GB417488A
Cited
US2171970A
Cited
US2143077A
Cited
US2149992A
Cited
US2255696A
Cited
US2267999A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-15 | 1962-06-16 | 1962-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-15 | 1966-06-16 | 1966-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-15 | 1970-06-16 | 1970-12-16 | $7700.00 | Window Closed / Lapsed |