US3649352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sensitive retroreflecting materials
Assignee: 3M Co
•
Filing: 1970-07-09
•
Granted: 1972-03-14
•
Expires: 1990-07-09
Abstract
Abstract An article useful as a label or thermal telltale which becomes visibly retroreflective in response to simple heating, provided by retroreflective elements masked with a heat-sensitive lightobscuring layer which is removed from the retroreflective elements by heating. A liquid-coating composition is also provided for preparing the article.
Inventors
- 👤 Calice G Courneya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:37
CPC Classifications
G; G09; G09F; G09F13/00; G09F13/16; B; B44; B44F; B44F1/00; B44F1/02; G09F3/00; G09F3/02; G09F3/0291; G09F3/0294; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2996; Y10T428/31504; Y10T428/31551; Y10T428/31645
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
23 words
The coating composition of claim 1 wherein said particles are tiny transparent spheres having an integral specularly reflective metal coating on one hemisphere.
Claim 2
Dependent Claim
11 words
The coating composition of claim 2 including a volatile propellent liquid.
Claim 3
Dependent Claim
50 words
An article having a surface which becomes retroreflective upon heating and comprising particles adapted to retroreflect light imbedded within a solid fusible obscuring layer which achieves a fluid state during heating to permit said fluid to be displaced physically exposing at least a portion of the surfaces of said beads.
Claim 4
Dependent Claim
13 words
The article of claim 4 wherein said retroreflective particles include heat-resistant transparent beads.
Claim 5
Dependent Claim
14 words
The article of claim 4 wherein said heat-sensitive obscuring layer consists of blush lacquer.
Claim 6
Dependent Claim
18 words
The article of claim 4 further comprising a substrate having attached to one surface thereof said retroreflective particles.
Claim 7
Dependent Claim
13 words
The article of claim 7 wherein the substrate is an electrical circuit component.
References Cited (Backward Citations)
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Cited
US2574971A
Cited
US2963378A
Cited
US2997403A
Cited
US3187068A
Cited
US3511700A
Cited
US3441948A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |