US2512257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-resistant compound lens transparent to infrared
Assignee: United States, WAR, Secretary of
•
Filing: 1947-01-09
•
Granted: 1950-06-20
•
Expires: 1967-01-09
Abstract
No abstract record available.
Inventors
- 👤 Pfund August Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:29
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/14; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/31826; Y10T428/31841
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
IN COMBINATION, AN ORDINARILY WATER SOLUBLE, INFRA-RED TRANSPARENT LENS HAVING AN INFRA-RED TRANSPARENT RUBBER COATING OF EXTREME THINNESS, AN INFRA-RED TRANSPARENT LENS HAVING AN INFRARED TRANSPARENT, ULTRA-VIOLET-OPAQUE COATING, SAID LENS BEING CEMENTED TOGETHER BY MEANS OF SAID RUBBER COATING, THE COMBINED LENSES BEING RESISTANT TO WATER IN DROP FORM FOR MORE THAN TWO HOURS.
Claim 2
Dependent Claim
54 words
IN COMBINATION, AN ORDINARILY WATER SOLUBLE, INFRA-RED TRANSPARENT LENS HAVING AN INFRA-RED TRANSPARENT RUBBER COATING OF EXTREME THINNESS, AN INFRA-RED TRANSPARENT LENS HAVING AN INFRARED TRANSPARENT, ULTRA-VIOLET-OPAQUE COATING, SAID LENS BEING CEMENTED TOGETHER BY MEANS OF SAID RUBBER COATING, THE COMBINED LENSES BEING RESISTANT TO WATER IN DROP FORM FOR MORE THAN TWO HOURS.
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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) | 1953-06-19 | 1953-12-19 | 1954-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-19 | 1957-12-19 | 1958-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-19 | 1961-12-19 | 1962-06-20 | $7700.00 | Window Closed / Lapsed |