Patent US4069423A successfully refreshed from Google Patents.
US4069423A
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Radiation source shielding and collimating device
Assignee: University of California, San Diego
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Filing: 1976-09-29
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Granted: 1978-01-17
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Expires: 1996-09-29
Abstract
Abstract Especially for use in agricultural machines such as lettuce harvesters having a maturity tester thereon, there is provided a radiation source such as Americium 241 sealed in a capsule at atmospheric pressure. The capsule is disposed in a plunger movable in an evacuated chamber between a first position in alignment with a passage having a window permeable by radiation to the outside and a second position in which the capsule is out of alignment with the passage. A pressure responsive switch monitors the pressure in the chamber and affords an alarm if the chamber pressure rises.
Inventors
- 👤 Roger E. Garrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:35
CPC Classifications
G; G21; G21G; G21G4/00; G21G4/04; G21G4/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
58 words
A radiation source shielding and collimating device comprising a body having a chamber therein, means defining a radiation passage from said chamber to the exterior of said body, a source of radiation at atmospheric pressure and in said chamber, means for subjecting said chamber to a subatmospheric pressure, and an indicator responsive to the pressure in said chamber.
Claim 2
Dependent Claim
58 words
A radiation source shielding and collimating device comprising a body having a chamber therein, means defining a radiation passage from said chamber to the exterior of said body, a source of radiation at atmospheric pressure and in said chamber, means for subjecting said chamber to a subatmospheric pressure, and an indicator responsive to the pressure in said chamber.
Claim 3
Dependent Claim
25 words
A device as in claim 1 in which said source includes a sealed capsule at substantially atmospheric interior pressure, and radioactive material in said capsule.
Claim 4
Dependent Claim
48 words
A device as in claim 2 including a plunger movable in said chamber and carrying said capsule, and means for moving said plunger between a first position with said capsule in alignment with said passage and a second position with said capsule out of alignment with said passage.
Claim 5
Dependent Claim
22 words
A device as in claim 1 in which said passage is closed to air flow by a window readily permeable to radiation.
Claim 6
Dependent Claim
17 words
A device as in claim 1 including a spring for urging said plunger toward said second position.
Claim 7
Dependent Claim
33 words
A device as in claim 1 in which said subjecting means includes a check valve urged closed by subatmospheric pressure in said chamber and openable by exterior application of a vacuum hose thereto.
Claim 8
Dependent Claim
17 words
A device as in claim 1 in which said means for moving said plunger includes a solenoid.
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) | 1981-01-16 | 1981-07-18 | 1982-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-16 | 1985-07-18 | 1986-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-16 | 1989-07-18 | 1990-01-17 | $7700.00 | Window Closed / Lapsed |