Patent US3700478A successfully refreshed from Google Patents.
US3700478A
Expired / Lapsed
US
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Microspheres having an antireflection coating and their use
Assignee: 3M Co
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Filing: 1970-11-09
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Granted: 1972-10-24
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Expires: 1990-11-09
Abstract
Abstract RETROREFLECTIVE SHEET CONSTRUCTIONS CONTAINING HIGH INDEX GLASS MICROSPHERES, WHICH MICROSPHERES CONTAIN AN ANTIREFLECTION COATING THEREON.
Inventors
- 👤 Wallace Karl Bingham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:39
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/12; G02B5/126; G02B5/128; C; C03; C03C; C03C17/00; Y; Y10; Y10T; Y10T428/00; Y10T428/25
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |