Patent US2610922A successfully refreshed from Google Patents.
US2610922A
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Reflex-reflector lens elements
Assignee: 3M Co
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Filing: 1950-03-14
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Granted: 1952-09-16
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Expires: 1970-03-14
Abstract
No abstract record available.
Inventors
- 👤 Warren R Beck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:59
CPC Classifications
C; C03; C03C; C03C12/00; C03C12/02; C03C3/00; C03C3/04; C03C3/062; C03C3/064
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
64 words
TRANSPARENT, WEATHER-RESISTANT, STRONG AND TOUGH, SMALL GLASS BEADS OR SPHERICLES HAVING A REFRACTIVE INDEX OF ABOUT 1.64-1.74 AND SUITABLE FOR INCORPORATION AS REFLEX-REFLECTIVE LENS ELEMENTS IN PAINTED HIGHWAY CENTER STRIPES, THE COMPONENTS OF OF THE GLASS COMPOSITION CONSISTING ESSENTIALLY OF THE FIRST FIVE AND AT LEAST ONE OF THE LAST THREE OF THE FOLLOWING IN THE INDICATED WEIGHT PERCENT AS CALCULATED FROM THE BATCH:
References Cited (Backward Citations)
US2517459A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-16 | 1956-03-17 | 1956-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-16 | 1960-03-17 | 1960-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-16 | 1964-03-17 | 1964-09-16 | $7700.00 | Window Closed / Lapsed |