US5339198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
All-polymeric cold mirror
Assignee: 3M Innovative Properties Co
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Filing: 1992-10-16
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Granted: 1994-08-16
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Expires: 2012-10-16
Abstract
Abstract An all-polymeric cold mirror which reflects visible wavelengths while transmitting a substantial portion of infrared wavelengths is provided. The mirror includes a sufficient number of alternating layers of at least first and second diverse polymeric materials such that at least 50% of peak reflecting visible light of a wavelength of between about 380-680 nm incident on the mirror is reflected and at least 50% of infrared light between about 680-2000 nm is transmitted or absorbed. The mirror may be designed so that it either reflects or absorbs ultraviolet light.
Inventors
- 👤 John A. Wheatly
- 👤 Gregg A. Motter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:28
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/08; G02B5/20; G02B5/206; G02B1/00; G02B1/04; G02B5/0891; G02B5/208; G02B5/26; G02B5/28; G02B5/285; G02B5/287; G02B5/0816; G02B5/0825; G02B5/0841
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
85 words
An all-polymeric cold mirror of at least first and second diverse polymeric materials, the mirror comprising a sufficient number of alternating layers of said first and second polymeric materials such that at least 50% of peak reflecting visible light of a wavelength of between about 380-680 nm incident on said polymeric cold mirror is reflected, at least 50% of infrared light between about 680-2000 nm is transmitted or absorbed, and wherein absorption in the wavelength range of between about 300-380 nm is at least 50%.
Claim 2
Dependent Claim
85 words
An all-polymeric cold mirror of at least first and second diverse polymeric materials, the mirror comprising a sufficient number of alternating layers of said first and second polymeric materials such that at least 50% of peak reflecting visible light of a wavelength of between about 380-680 nm incident on said polymeric cold mirror is reflected, at least 50% of infrared light between about 680-2000 nm is transmitted or absorbed, and wherein absorption in the wavelength range of between about 300-380 nm is at least 50%.
Claim 3
Dependent Claim
21 words
The polymeric cold mirror of claim 1 wherein one of said polymeric layers includes an ultraviolet light absorbing dye or pigment.
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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) | 1997-08-15 | 1998-02-14 | 1998-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-15 | 2002-02-14 | 2002-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-15 | 2006-02-14 | 2006-08-16 | $7700.00 | Window Closed / Lapsed |