US3290499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film for indicating dosage of ionizing radiation
Assignee: United Kingdom Atomic Energy Authority
•
Filing: 1961-10-31
•
Granted: 1966-12-06
•
Expires: 1981-10-31
Abstract
No abstract record available.
Inventors
- 👤 Vale Raymond Lester
- 👤 Farrell John Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:59
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/02; G01T1/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A RADIATION INDICATOR FOR IONIZING RADIATION COMPRISING A SUPPORT AND FIRST AND SECOND LAYERS THEREON, SAID FIRST LAYER COMPRISING A DRIED AQUEOUS EMULSION OF A HALOGEN-CONTAINING POLYMER COMPOSITION CONTAINING AN ACID-SENSITIVE DYE WHICH DYE GIVES A COLOR CHANGE ON REACTION WITH A HALOGEN ACID LIBERATED FROM SAID HALOGENCONTAINING POLYMER UPON EXPOSURE THEREOF TO IONIZING RADIATION, SAID SECOND LAYER BEING ON THE SIDE OF SAID FIRST LAYER WHICH IS REMOTE FROM THE SUPPORT AND COMPRISING A TRANSPARENT PROTECTIVE LAYER INCLUDING MATERIALS WHICH PROTECT SAID FIRST LAYER FROM THE EFFECTS OF ULTRA-VIOLET AND VISIBLE LIGHT.
Claim 2
Dependent Claim
93 words
A RADIATION INDICATOR FOR IONIZING RADIATION COMPRISING A SUPPORT AND FIRST AND SECOND LAYERS THEREON, SAID FIRST LAYER COMPRISING A DRIED AQUEOUS EMULSION OF A HALOGEN-CONTAINING POLYMER COMPOSITION CONTAINING AN ACID-SENSITIVE DYE WHICH DYE GIVES A COLOR CHANGE ON REACTION WITH A HALOGEN ACID LIBERATED FROM SAID HALOGENCONTAINING POLYMER UPON EXPOSURE THEREOF TO IONIZING RADIATION, SAID SECOND LAYER BEING ON THE SIDE OF SAID FIRST LAYER WHICH IS REMOTE FROM THE SUPPORT AND COMPRISING A TRANSPARENT PROTECTIVE LAYER INCLUDING MATERIALS WHICH PROTECT SAID FIRST LAYER FROM THE EFFECTS OF ULTRA-VIOLET AND VISIBLE LIGHT.
References Cited (Backward Citations)
US2431745A
Cited
US2700736A
Cited
US2874299A
Cited
US2738429A
Cited
US2848625A
Cited
US2858447A
Cited
US3031575A
Cited
US3110618A
Cited
US3131080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |