US3418470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording medium utilizing grain-free fluorescent material
Assignee: 3M Co
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Filing: 1964-10-27
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Granted: 1968-12-24
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Expires: 1984-10-27
Abstract
No abstract record available.
Inventors
- 👤 Stephen P Birkeland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:07
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/182; G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; G06; G06K; G06K19/00; G06K19/02; G11; G11C; G11C13/00; G11C13/04; G11C13/048
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |