US2642367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of protecting lenses
Assignee: United States, WAR, Secretary of
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Filing: 1950-03-27
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Granted: 1953-06-16
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Expires: 1970-03-27
Abstract
No abstract record available.
Inventors
- 👤 Pfund August Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:24
CPC Classifications
G02B1/105; G; G02; G02B; G02B1/00; G02B1/10; G02B1/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
THE METHOD OF PROTECTING THE SURFACE OF A LENS WHICH IS MADE FROM A SALT OF SILVER NORMALLY DECOMPOSIBLE AT THE SURFACE THEREOF BY ULTRAVIOLET LIGHT, WHICH COMPRISES VAPORIZING IN A HIGH VACUUM A PROTECTIVE COATING CHEMICAL SELECTED FROM THE GROUP CONSISTING OF ANTIMONY TRISULFIDE AND AMORPHOUS ELEMENTAL SELENIUM, CONDENSING THE VAPORS THEREOF UPON THE SURFACES OF SAID LENS AND CONTINUING THE PROCESS UNTIL THE LENS APPEARS DEEP ORANGE TO RED BY TRANSMITTED LIGHT, WHEREBY SAID LENS IN LIGHT-PROOFED AGAINST ULTRAVIOLET RAYS.
Claim 2
Independent Claim
82 words
THE METHOD OF PROTECTING THE SURFACE OF A LENS WHICH IS MADE FROM A SALT OF SILVER NORMALLY DECOMPOSIBLE AT THE SURFACE THEREOF BY ULTRAVIOLET LIGHT, WHICH COMPRISES VAPORIZING IN A HIGH VACUUM A PROTECTIVE COATING CHEMICAL SELECTED FROM THE GROUP CONSISTING OF ANTIMONY TRISULFIDE AND AMORPHOUS ELEMENTAL SELENIUM, CONDENSING THE VAPORS THEREOF UPON THE SURFACES OF SAID LENS AND CONTINUING THE PROCESS UNTIL THE LENS APPEARS DEEP ORANGE TO RED BY TRANSMITTED LIGHT, WHEREBY SAID LENS IN LIGHT-PROOFED AGAINST ULTRAVIOLET RAYS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-15 | 1956-12-15 | 1957-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-15 | 1960-12-15 | 1961-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-15 | 1964-12-15 | 1965-06-16 | $7700.00 | Window Closed / Lapsed |