Patent US3645771A successfully refreshed from Google Patents.
US3645771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer blooming process including precoating of the substrate used for monitoring
Assignee: Australian Government
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Filing: 1969-05-07
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Granted: 1972-02-29
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Expires: 1989-05-07
Abstract
Abstract A method of carrying out multilayer blooming which includes means to more accurately measure the thickness of the layers during blooming which consists in the use of a stack having at least one layer thereon to enhance the light transmission or reflection difference as the blooming layers are deposited on the stack during blooming of the articles, the stack preferably comprising a substrate having precoated thereon alternately high and low refractive index materials having an optical thickness of a quarter wavelength or multiples thereof at a selected wavelength.
Inventors
- 👤 John Ward
- 👤 Commonwealth Of Australia The
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:21
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/34; C03C17/3411; C03C17/3429; C03C17/3494; C03C17/3447; C03C17/3452; C03C17/3464; C03C17/347; C23; C23C; C23C14/00; C23C14/22; C23C14/54; C23C14/542; C23C14/545; C23C14/547
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
21 words
The method of claim 1 wherein the light is passed through or reflected from the precoated substrate to a simple photometer.
Claim 2
Dependent Claim
29 words
The method of claim 1 wherein the stack comprises a light transmitting base having coated thereon two quarter wavelength layers of ZnS separated by a quarter wavelength of cryolite.
Claim 3
Dependent Claim
32 words
The method of claim 1 in which the number of alternately high and low refractive index materials have an optical thickness of a quarter wavelength or multiples thereof at a selected wavelength.
Claim 4
Dependent Claim
45 words
The mEthod of claim 1 in which the alternately high and low refractive index materials have an optical thickness of a quarter wavelength or multiples thereof at a selected wavelength and wherein the high index material is ZnS and the low index material is cryolite.
Claim 5
Dependent Claim
47 words
The method of claim 1 in which the number of alternately high and low refractive index materials have an optical thickness of a quarter wavelength or multiples thereof at a selected wavelength and wherein the high index material is ZnS and the low index material is MgF1.
Claim 6
Dependent Claim
47 words
The method of claim 1 in which the number of alternately high and low refractive index materials have an optical thickness of a quarter wavelength or multiples thereof at a selected wavelength and wherein the high index material is PbF2 and the low index material is MgF2.
Claim 7
Dependent Claim
53 words
The method of claim 1 wherein the stack comprises a light transmitting base having precoated thereon two quarter wavelength layers separated by a quarter wavelength layer of a further material selected, so that the second layer reduces the reflectivity curve of the first layer, and the third layer enhances the final reflectivity curve.
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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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |