US4648689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pavement marking tape
Assignee: 3M Co
•
Filing: 1985-05-03
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Granted: 1987-03-10
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Expires: 2005-05-03
Abstract
Abstract A lane delineation tape is disclosed comprising a strip of cellular polymer having a reflecting layer on top and an adhesive on the bottom surface for adhering it to a road surface. Preferably it is made of elastomeric foam having a relatively low compressive strength, e.g. 100 kPa at 25% compression.
Inventors
- 👤 David C. May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:58
CPC Classifications
E; E01; E01F; E01F9/00; E01F9/50; E01F9/553; E01F9/565; E01F9/573; E01F9/576; E01F9/578
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
48 words
A pavement marking tape comprising a strip of cellular elastomer having a compressive strength of less than about 100 kiloPascals at 25 percent compression, said strip having a reflective layer on its top surface and an adhesive on the bottom surface for adhering it to a road surface.
Claim 2
Dependent Claim
48 words
A pavement marking tape comprising a strip of cellular elastomer having a compressive strength of less than about 100 kiloPascals at 25 percent compression, said strip having a reflective layer on its top surface and an adhesive on the bottom surface for adhering it to a road surface.
Claim 3
Dependent Claim
35 words
A pavement marking tape of claim 1 in which the cellular elastomer is selected from the group consisting of polyurethane, silicone rubber, neoprene rubber, ethylene propylene, diene terpolymer (EPDM), and blends of neoprene and EPDM.
Claim 4
Dependent Claim
12 words
The pavement marking tape of claim 1 having a convex top surface.
Claim 5
Dependent Claim
75 words
The pavement marking tape of claim 1 wherein the reflective layer of the top surface comprises wide angle flat top reflective sheeting comprising: a back reflector; an overlying transparent matrix; a light-returning layer of small transparent spheres embedded in the transparent matrix in optical connection with the back reflector, but spaced from it so as to place the reflector at the approximate focal point of the spheres; and a transparent covering layer overlying the spheres.
Claim 6
Dependent Claim
26 words
The pavement marking tape of claim 4 wherein the transparent matrix of the wide angle flat top sheet is made of a polymer which is elastic.
Claim 7
Dependent Claim
15 words
The pavement marking tape of claim 1 wherein the adhesive is a pressure sensitive adhesive.
References Cited (Backward Citations)
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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) | 1990-03-09 | 1990-09-08 | 1991-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-09 | 1994-09-08 | 1995-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-09 | 1998-09-08 | 1999-03-10 | $7700.00 | Window Closed / Lapsed |