Patent US3731177A successfully refreshed from Google Patents.
US4497700A
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Method of coating a transparent substrate
Assignee: Pilkington Deutschland AG
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Filing: 1984-03-22
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Granted: 1985-02-05
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Expires: 2004-03-22
Abstract
Abstract Optical filters, e.g. for reflecting infrared radiation while passing visible light radiation is made by applying to the silver reflective coating a protective coating of a metal oxide by magnetron cathode sputtering and only thereafter is the dereflective layer applied by magnetron cathode sputtering. The protective coating-oxygen partial pressure and coating rate are substantially less than the dereflective coating-oxygen partial pressure and coating rate. Apparently the protective coating prevents damage to the reflective coating.
Inventors
- 👤 Rolf Groth
- 👤 Dieter Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:03
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/34; C03C17/36; C03C17/3602; C03C17/3618; C03C17/3644; C03C17/3657; C23; C23C; C23C14/00; C23C14/0021; C23C14/0036; C03C2217/00; C03C2217/70; C03C2217/73; C03C2217/732
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
124 words
A method of coating a transparent substrate with a multilayer optical filter which comprises the steps of: (a). applying a reflective silver coating to said substrate; (b). thereafter applying a protective coating to said silver coating of a metal oxide by magnetron cathode sputtering at an S protective coating rate and in an S protective coating partial pressure; (c). thereafter applying by magnetron cathode sputtering a dereflective metal oxide coating at an E dereflective coating-oxygen partial pressure and at an E dereflective coating rate; and (d). controlling the coating rates during the application of said protective and dereflective coating so that the S partial pressure is less than the E partial pressure and the S coating rate is less than the E coating rate.
Claim 2
Independent Claim
124 words
A method of coating a transparent substrate with a multilayer optical filter which comprises the steps of: (a). applying a reflective silver coating to said substrate; (b). thereafter applying a protective coating to said silver coating of a metal oxide by magnetron cathode sputtering at an S protective coating rate and in an S protective coating partial pressure; (c). thereafter applying by magnetron cathode sputtering a dereflective metal oxide coating at an E dereflective coating-oxygen partial pressure and at an E dereflective coating rate; and (d). controlling the coating rates during the application of said protective and dereflective coating so that the S partial pressure is less than the E partial pressure and the S coating rate is less than the E coating rate.
Claim 3
Dependent Claim
17 words
The method defined in claim 1 wherein said dereflective coating is applied by reactive magnetron cathode deposition.
Claim 4
Dependent Claim
17 words
The method defined in claim 1 wherein said protective coating is applied by reactive magnetron cathode sputtering.
Claim 5
Dependent Claim
38 words
The method defined in claim 3 wherein said protective coating is appied by sputtering using as a target at least one substance selected from the group which consists of tin, indium, tin-doped indium, lead, zinc, titanium and tantalum.
Claim 6
Dependent Claim
42 words
The method defined in claim 1 wherein said protective coating is applied by magnetron sputtering from a target selected from the group which consists of tin oxide, indium oxide, tin oxide-doped indium oxide, lead oxide, zinc oxide, titanium oxide and tantalum oxide.
Claim 7
Dependent Claim
48 words
The method defined in claim 1 wherein the S partial pressure and the S coating rate during the application of the protective coating are both less by a factor of at least 0.5 than the E partial pressure and E coating rate during application of the dereflective coating.
Claim 8
Dependent Claim
53 words
The method defined in claim 1 wherein said silver coating is applied in a thickness between substantially 50 Å and 300 Å, the protective coating is applied in a thickness between substantially 20 Å and 100 Å and the dereflective coating is applied in a thickness of substantially 250 Å and 600 Å.
Claim 9
Dependent Claim
66 words
The method defined in claim 1 wherein the S partial pressure is at most 3×10 -4 mbar and the S coating rate is at most 8 Å per second during the application of the protective coating and the E partial pressure is at least 7×10 -4 mbar and the E coating rate is at least 20 Å per second during the application of the dereflective coating.
Claim 10
Dependent Claim
22 words
The method defined in claim 8 wherein the E coating rate is substantially 35 Å per second to 40 Å per second.
Claim 11
Dependent Claim
10 words
An optical filter made by the method of claim 1.
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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) | 1988-02-05 | 1988-08-06 | 1989-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-05 | 1992-08-06 | 1993-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-05 | 1996-08-06 | 1997-02-05 | $7700.00 | Window Closed / Lapsed |