US4780491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microbubble-filled article
Assignee: 3M Co
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Filing: 1987-02-09
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Granted: 1988-10-25
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Expires: 2007-02-09
Abstract
Abstract The invention primarily concerns a pressure-sensitive adhesive tape, the adhesive layer of which is filled with glass microbubbles and has a dark appearance by virtue of (1) the microbubbles are stained glass which preferably is dark, and (2) dispersed throughout the adhesive layer is a pigment or dye which preferably is dark. More broadly, the invention concerns any coherent article filled with stained-glass microbubbles. The glass of the microbubbles preferably has an ultraviolet window, permitting the article to be made by photopolymerizing a matrix filled with the microbubbles.
Inventors
- 👤 George F. Vesley
- 👤 Alan H. Paulson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:33
CPC Classifications
C; C09; C09J; C09J133/00; C09J133/04; C09J133/06; C09J7/00; C08; C08K; C08K3/00; C08K3/40; C09J7/30; C09J7/38; C09J7/381; C09J7/385; C08L; C08L2666/00; C08L2666/54; C09J2301/00; C09J2301/30; C09J2301/302; Y; Y10; Y10T; Y10T428/00; Y10T428/14; Y10T428/1405; Y10T428/25; Y10T428/252; Y10T428/256; Y10T428/257; Y10T428/258; Y10T428/28; Y10T428/2852; Y10T428/2857; Y10T428/2878; Y10T428/2887; Y10T428/2891; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2996; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31928
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
74 words
A coherent article comprising a polymeric matrix filled with glass microbubbles comprising at least 5 volume percent of the polymeric matrix, wherein the improvement comprises: the microbubbles have an average diameter of from 5 to 200 micrometers and are stained glass, said stained glass containing metal oxides which produce a colored appearance, and dispersed throughout the polymeric matrix is a pigment or dye comprising from 0.04 to 0.12% by weight of the polymeric matrix.
Claim 2
Dependent Claim
74 words
A coherent article comprising a polymeric matrix filled with glass microbubbles comprising at least 5 volume percent of the polymeric matrix, wherein the improvement comprises: the microbubbles have an average diameter of from 5 to 200 micrometers and are stained glass, said stained glass containing metal oxides which produce a colored appearance, and dispersed throughout the polymeric matrix is a pigment or dye comprising from 0.04 to 0.12% by weight of the polymeric matrix.
Claim 3
Dependent Claim
18 words
An article as defined in claim 1 wherein the stained glass of the microbubbles has an ultraviolet window.
Claim 4
Dependent Claim
19 words
An article as defined in claim 2 wherein the average density of the stained-glass microbubbles is less than 0.4.
Claim 5
Dependent Claim
20 words
An article as defined in claim 1 wherein the microbubbles comprise from 10 to 65 volume percent of the article.
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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) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |