Patent JPS5658167A successfully refreshed from Google Patents.
Patent US2977252A successfully refreshed from Google Patents.
US2977252A
Expired / Lapsed
US
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Photosurface and method of making same
Assignee: Schlumberger Well Surveying Corp
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Filing: 1956-07-20
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Granted: 1961-03-28
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Expires: 1976-07-20
Abstract
No abstract record available.
Inventors
- 👤 Causse Jean-Pierre
- 👤 Lallemand Andre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:22
CPC Classifications
H; H01; H01J; H01J40/00; H01J40/02; H01J40/04; H01J40/06; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/38; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
IN A METHOD OF PREPARING A SEMITRANSPARENT PHOTOSURFACE ON A TRANSPARENT WINDOW, THE STEPS COMPRISING PASSING CURRENT THROUGH A PURE TUNGSTEN FILAMENT OPPOSITE SAID WINDOW IN A VACUUM TO EVAPORATE THE TUNGSTEN OF SAID FILAMENT ONTO SAID WINDOW, PHOTOELECTRICALLY DETECTING THE DECREASE IN RADIATION TRANSMITTED FROM SAID FILAMENT THROUGH SAID WINDOW AS A UNIFORM FILM OF SAID PURE TUNGSTEN IS CONDENSED ON SAID WINDOW, TERMINATING THE EVAPORTATION OF SAID PURE TUNGSTEN AT A TIME WHEN THE DETECTED DECREASE IN THE TRANSMITTED RADIATION IS A PREDETERMINED FRACTION ON THE ORDER OF 10% OF THE MAXIMUM DETECTED RADIATION, AND WHILE MAINTAINING THE VACUUM VOLATILIZING SUCCESSIVE METALS OPPOSITE SAID WINDOW TO EVAPORATE A PHOTOSENSITIVE INTERMETALLIC COMPOUND ONTO THE UNIFORM TUNGSTEN FILM OUT OF REACTIVE CONTACT WITH SAID WINDOW.
Claim 2
Dependent Claim
125 words
IN A METHOD OF PREPARING A SEMITRANSPARENT PHOTOSURFACE ON A TRANSPARENT WINDOW, THE STEPS COMPRISING PASSING CURRENT THROUGH A PURE TUNGSTEN FILAMENT OPPOSITE SAID WINDOW IN A VACUUM TO EVAPORATE THE TUNGSTEN OF SAID FILAMENT ONTO SAID WINDOW, PHOTOELECTRICALLY DETECTING THE DECREASE IN RADIATION TRANSMITTED FROM SAID FILAMENT THROUGH SAID WINDOW AS A UNIFORM FILM OF SAID PURE TUNGSTEN IS CONDENSED ON SAID WINDOW, TERMINATING THE EVAPORTATION OF SAID PURE TUNGSTEN AT A TIME WHEN THE DETECTED DECREASE IN THE TRANSMITTED RADIATION IS A PREDETERMINED FRACTION ON THE ORDER OF 10% OF THE MAXIMUM DETECTED RADIATION, AND WHILE MAINTAINING THE VACUUM VOLATILIZING SUCCESSIVE METALS OPPOSITE SAID WINDOW TO EVAPORATE A PHOTOSENSITIVE INTERMETALLIC COMPOUND ONTO THE UNIFORM TUNGSTEN FILM OUT OF REACTIVE CONTACT WITH SAID WINDOW.
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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) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |