Patent US3121792A successfully refreshed from Google Patents.
US3121792A
Expired / Lapsed
US
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Method of density differentiation in radiography
Assignee: Individual
•
Filing: 1961-04-18
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Granted: 1964-02-18
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Expires: 1981-04-18
Abstract
No abstract record available.
Inventors
- 👤 Georg S Mittelstaedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:48
CPC Classifications
G; G03; G03B; G03B42/00; G03B42/02; G03C; G03C5/00; G03C5/16; Y; Y10; Y10S; Y10S430/00; Y10S430/167; Y10S430/168
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
RADIOGRAPHIC METHOD CONSISTING IN EXPOSING SENSITIVE PHOTOGRAPHIC FILM TO PENETRATING RAYS THROUGH AN OBJECT UNTIL THE FILM IS BURNED, DEVELOPING THE BURNT FILM AND PROJECTING LIGHT RADIATION TO A SENSITIVE PHOTOGRAPHIC ELEMENT THROUGH THE BURNED FILM.
Claim 2
Dependent Claim
36 words
RADIOGRAPHIC METHOD CONSISTING IN EXPOSING SENSITIVE PHOTOGRAPHIC FILM TO PENETRATING RAYS THROUGH AN OBJECT UNTIL THE FILM IS BURNED, DEVELOPING THE BURNT FILM AND PROJECTING LIGHT RADIATION TO A SENSITIVE PHOTOGRAPHIC ELEMENT THROUGH THE BURNED FILM.
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) | 1967-02-17 | 1967-08-19 | 1968-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-17 | 1971-08-19 | 1972-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-17 | 1975-08-19 | 1976-02-18 | $7700.00 | Window Closed / Lapsed |