US2904450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent coating
Assignee: Ford Motor Co
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Filing: 1958-05-14
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Granted: 1959-09-15
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Expires: 1978-05-14
Abstract
No abstract record available.
Inventors
- 👤 Max J Irland
- 👤 Eugene B Schermer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:44
CPC Classifications
G02B1/105; G; G02; G02B; G02B1/00; G02B1/10; G02B1/14; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12556; Y10T428/12569; Y10T428/12611; Y10T428/12674; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
AN OPTICAL ELEMENT HAVING A RESISTANCE TO SCRATCHING AND MECHANICAL ABRASION OF THE SAME ORDER AS GLASS AND COMPRISING A MASSIVE SUBSTRATE WHICH IS MATERIALLY SOFTER THAN GLASS, A LAYER OF TERMANIUM ADJACENT THE SOFT SUBSTRATE AND A LAYER OF AN OXIDE OF SILICON SUPERIMPOSED UPON THE GERMANIUM LAYER.
Claim 2
Dependent Claim
49 words
AN OPTICAL ELEMENT HAVING A RESISTANCE TO SCRATCHING AND MECHANICAL ABRASION OF THE SAME ORDER AS GLASS AND COMPRISING A MASSIVE SUBSTRATE WHICH IS MATERIALLY SOFTER THAN GLASS, A LAYER OF TERMANIUM ADJACENT THE SOFT SUBSTRATE AND A LAYER OF AN OXIDE OF SILICON SUPERIMPOSED UPON THE GERMANIUM LAYER.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |