US3556637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reflex-reflecting aggregate and markers prepared therefrom
Assignee: 3M Co
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Filing: 1968-06-27
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Granted: 1971-01-19
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Expires: 1988-06-27
Abstract
Abstract Aggregates particularly suitable for use in highway marking an having a spherical lens element of a refractive index below 1.9, a transparent binder coating thereon and, hemispherically embedded in said binder coatings, glass beads having a diameter from about 25 to 150 microns and having a refractive index of at least 2.1. These aggregated may be hemispherically embedded in a resinous base having light reflecting properties. A preferred form of the aggregate includes a light reflecting coating on the exposed or non-embedded surfaces of the glass beads.
Inventors
- 👤 Philip V Palmquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:20
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/12; G02B5/126; G02B5/128; E; E01; E01F; E01F9/00; E01F9/50; E01F9/506; E01F9/524
Claims Analysis
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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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |