US4100625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helmets and other articles reflectorized with retroreflective platelet particles
Assignee: 3M Co
•
Filing: 1977-07-18
•
Granted: 1978-07-18
•
Expires: 1997-07-18
Abstract
Abstract Helmets and other articles are made reflective through the use of coatings which include retroreflective platelet particles cut from a larger retroreflective sheeting.
Inventors
- 👤 Chi Fang Tung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:43
CPC Classifications
A; A42; A42B; A42B3/00; A42B3/04; A42B3/06; A42B3/061
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
95 words
An article carrying on a surface of the article a coating that comprises a transparent binder film and retroreflective platelet particles dispersed in said film; said platelet particles comprising flat segments cut from a larger retroreflective sheeting; the shortest dimension of a face of the segments averaging at least about one-and-one-half times the thickness of the segments and the segments including a monolayer of retroreflective elements optically exposed over at least one face of the segments; the index of refraction of said binder film being such that said segments retroreflect light incident on the film.
Claim 2
Dependent Claim
95 words
An article carrying on a surface of the article a coating that comprises a transparent binder film and retroreflective platelet particles dispersed in said film; said platelet particles comprising flat segments cut from a larger retroreflective sheeting; the shortest dimension of a face of the segments averaging at least about one-and-one-half times the thickness of the segments and the segments including a monolayer of retroreflective elements optically exposed over at least one face of the segments; the index of refraction of said binder film being such that said segments retroreflect light incident on the film.
Claim 3
Dependent Claim
14 words
A coated article of claim 1 in which the article coated is a helmet.
Claim 4
Dependent Claim
40 words
A coated article of claim 1 in which said segments are cut from sheeting that comprises two retroreflective sheetings laminated back-to-back so that said segments have a monolayer of retroreflective elements optically exposed over both large-area faces of the segment.
Claim 5
Dependent Claim
14 words
A coated article of claim 3 in which the article coated is a helmet.
Claim 6
Dependent Claim
27 words
A coated article of claim 1 in which said monolayer of retroreflective elements comprises a monolayer of transparent microspheres covered by a flat exterior transparent cover layer.
Claim 7
Dependent Claim
14 words
A coated article of claim 5 in which the article coated is a helmet.
References Cited (Backward Citations)
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Cited
US4008949A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |