Patent US3356523A successfully refreshed from Google Patents.
US3356523A
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Polystyrene film containing an antireflection coating
Assignee: McDonnell Douglas Corp
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Filing: 1964-02-10
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Granted: 1967-12-05
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Expires: 1984-02-10
Abstract
No abstract record available.
Inventors
- 👤 Barbara A Libbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:56
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/06; B; B29; B29D; B29D11/00; B29D11/0073; C08J7/043; C08J7/046; G; G02; G02B; G02B1/00; G02B1/10; G02B1/11; G02B1/113; G02B1/115; G03; G03C; G03C1/00; G03C1/76; G03C1/825; C08J2325/00; C08J2325/02; C08J2325/04; C08J2325/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A TRANSPARENT POLYSTYRENE SUBSTANCE CONTAINING ON A SURFACE THEREOF A TRANSPARENT MULTILAYER ANTIREFLECTION COATING COMPRISING A FIRST LAYER OF SILICON MONOXIDE ADJACENT SAID SUBSTRATE, AND A SECOND LAAYER OF MAGNESIUM FLOURIDE OVER SAID FIRST LAYER.
Claim 2
Dependent Claim
35 words
A TRANSPARENT POLYSTYRENE SUBSTANCE CONTAINING ON A SURFACE THEREOF A TRANSPARENT MULTILAYER ANTIREFLECTION COATING COMPRISING A FIRST LAYER OF SILICON MONOXIDE ADJACENT SAID SUBSTRATE, AND A SECOND LAAYER OF MAGNESIUM FLOURIDE OVER SAID FIRST LAYER.
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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) | 1970-12-04 | 1971-06-05 | 1971-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-04 | 1975-06-05 | 1975-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-04 | 1979-06-05 | 1979-12-05 | $7700.00 | Window Closed / Lapsed |