US3980696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photodosimeter film badge
Assignee: Beckman Coulter Inc
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Filing: 1974-07-25
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Granted: 1976-09-14
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Expires: 1994-07-25
Abstract
Abstract A film badge sensitive to non-ionizing radiation and a method of making same. The film badge consists of dissolved bilirubin bound in a polymeric film base and sealed within an optically transparent substrate. The film badge is useful during phototherapy for the treatment of hyperbilirubinemia in the newborn and is capable of measuring the total irradiance effective in decomposing bilirubin.
Inventors
- 👤 Robert J. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:27
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; G03C1/731; B; B32; B32B; B32B27/00; B32B27/18; Y; Y10; Y10S; Y10S436/00; Y10S436/902; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1062; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928; Y10T428/31971; Y10T436/00; Y10T436/10; Y10T436/103332; Y10T436/14; Y10T436/145555; Y10T436/146666
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
103 words
A dosimeter for use in the treatment of hyperbilirubinemia by phototherapy comprising: a. a thin film of uniform thickness comprising dissolved bilirubin bound in a polymeric base, said bilirubin being substantially only the IX-alpha isomer thereof in sufficient concentration to cause a detectable change in the optical density of said film upon exposure to light having a wavelength of about 425-500 nanometers; and, b. an optically transparent substrate impervious to the passage of oxygen and sealing said film whereby oxygen is excluded from contacting said film while light striking said film will cause photodecomposition of the bilirubin without transforming the bilirubin into biliverdin.
Claim 2
Dependent Claim
103 words
A dosimeter for use in the treatment of hyperbilirubinemia by phototherapy comprising: a. a thin film of uniform thickness comprising dissolved bilirubin bound in a polymeric base, said bilirubin being substantially only the IX-alpha isomer thereof in sufficient concentration to cause a detectable change in the optical density of said film upon exposure to light having a wavelength of about 425-500 nanometers; and, b. an optically transparent substrate impervious to the passage of oxygen and sealing said film whereby oxygen is excluded from contacting said film while light striking said film will cause photodecomposition of the bilirubin without transforming the bilirubin into biliverdin.
Claim 3
Dependent Claim
19 words
The dosimeter of claim 1 wherein said substrate comprises two pieces of optically transparent material sealing said film therebetween.
Claim 4
Dependent Claim
28 words
A dosimeter according to claim 1 having an action spectrum which is the same as the action spectrum for the photodecomposition of serum bilirubin in the human body.
Claim 5
Dependent Claim
34 words
A dosimeter according to claim 3 wherein the kinetics of the change in optical density of said film badge is similar to the kinetics of the photodecomposition of serum bilirubin in the human body.
Claim 6
Dependent Claim
18 words
A dosimeter according to claim 1 wherein said polymeric film base is a copolymer of acrylic with melamine.
Claim 7
Dependent Claim
14 words
A dosimeter according to claim 1 wherein said polymeric base is polycarbonate or phenoxy.
Claim 8
Dependent Claim
12 words
A dosimeter according to claim 1 wherein said polymeric base is polystyrene.
Claim 9
Dependent Claim
17 words
A dosimeter according to claim 1 wherein said polymeric base is a copolymer of styrene and methylmethacrylate.
Claim 10
Dependent Claim
14 words
A dosimeter according to claim 1 wherein said polymeric base is ethylene-vinyl acetate copolymer.
Claim 11
Dependent Claim
13 words
A dosimeter according to claim 1 wherein said polymeric base is polymethyl methacrylate.
References Cited (Backward Citations)
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US3092465A
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US3420635A
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US3502437A
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US3853476A
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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) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |