US4581288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite photochromic lenses
Assignee: Corning Glass Works
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Filing: 1985-01-23
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Granted: 1986-04-08
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Expires: 2005-01-23
Abstract
Abstract The instant invention is concerned with the production of essentially transparent glass/plastic composite articles. The articles consist of glass particles having water-free surfaces and dimensions of about 0.5-100 microns dispersed within a plastic matrix, the glass particles constituting up to 50% by weight of the articles and having a refractive index appropriate to or compatible with the plastic matrix.
Inventors
- 👤 Kenneth T. Barnhart
- 👤 Carlo M. Golino
- 👤 Candace J. Quinn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:23
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/40; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/25; Y10T428/252
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
62 words
An essentially transparent glass/plastic composite body free from trapped air and voids consisting of particles of a glass having dimensions between about 0.5-100 microns and water-free surfaces and being dispersed within a plastic matrix, said glass particles comprising up to 50% by weight of said composite body and having a refractive index within the range of about ±0.002 of the plastic matrix.
Claim 2
Dependent Claim
62 words
An essentially transparent glass/plastic composite body free from trapped air and voids consisting of particles of a glass having dimensions between about 0.5-100 microns and water-free surfaces and being dispersed within a plastic matrix, said glass particles comprising up to 50% by weight of said composite body and having a refractive index within the range of about ±0.002 of the plastic matrix.
Claim 3
Dependent Claim
20 words
An essentially transparent glass/plastic composite body according to claim 1 wherein said glass particles have dimensions between about 10-50 microns.
Claim 4
Dependent Claim
23 words
An essentially transparent glass/plastic composite body according to claim 1 wherein said glass particles comprise about 5-30% by weight of said composite body.
Claim 5
Dependent Claim
16 words
An essentially transparent glass/plastic composite body according to claim 1 wherein said glass exhibits photochromic properties.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |