US4190461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for removing metallic seeds from nylon tubing used in interstitial brachytherapy
Assignee: Alpha Omega Services Inc
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Filing: 1978-03-20
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Granted: 1980-02-26
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Expires: 1998-03-20
Abstract
Abstract Described herein is a method for removing radioactive metal seeds from embedment in nylon. Nylon is added to a solvent to form a mixture comprising dissolved and undissolved nylon, solvent, and metallic seeds and the mixture is subjected to ultrasonic waves to substantially completely dissolve the nylon in the solvent, thus freeing up the metallic seeds. The solvent is decanted and the foregoing steps are repeated followed by adding acetone and decanting all resulting liquid. Finally the seeds are dried.
Inventors
- 👤 Bruce W. Hedger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:35
CPC Classifications
A; A61; A61N; A61N5/00; A61N5/10; A61N5/1001; A61N5/1027; G; G21; G21F; G21F9/00; G21F9/28; A61N2005/1019; A61N2005/1023
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
65 words
A method for recovering metallic seeds embedded in nylon which comprises the steps: a. adding nylon with radioactive metallic seeds embedded therein to a solvent in which nylon dissolves to form a mixture comprising dissolved and undissolved nylon, solvent, and metallic seeds; and b. subjecting the mixture to ultrasonic waves to substantially completely dissolve the nylon in the solvent, thus freeing up the metallic seeds.
Claim 2
Independent Claim
65 words
A method for recovering metallic seeds embedded in nylon which comprises the steps: a. adding nylon with radioactive metallic seeds embedded therein to a solvent in which nylon dissolves to form a mixture comprising dissolved and undissolved nylon, solvent, and metallic seeds; and b. subjecting the mixture to ultrasonic waves to substantially completely dissolve the nylon in the solvent, thus freeing up the metallic seeds.
Claim 3
Dependent Claim
12 words
A method according to claim 1 wherein the metallic seeds are radioactive.
Claim 4
Dependent Claim
11 words
A method according to claim 1 wherein the solvent is phenol.
Claim 5
Dependent Claim
17 words
A method according to claim 1 wherein the radioactive metallic seeds are embedded in a nylon ribbon.
Claim 6
Dependent Claim
18 words
A method according to claim 1 wherein the mixture is subjected to ultrasonic waves in an ultrasonic cleaner.
Claim 7
Dependent Claim
19 words
A method according to claim 5 wherein the mixture is subjected to ultrasonic waves for 8 to 12 minutes.
Claim 8
Independent Claim
96 words
A method for removing radioactive metallic seeds from embedment in nylon, the method comprising: adding nylon with radioactive metallic seeds embedded therein to a solvent in which nylon dissolves to form a mixture comprising dissolved and undissolved nylon, solvent and metallic seeds; vibrating the mixture at ultrasonic frequencies to substantially completely dissolve the nylon in the solvent, thus freeing up the metallic seeds; decanting the solvent and repeating the foregoing steps of adding solvent and vibrating at ultrasonic frequencies; and thereafter adding acetone to the vibrated mixture, decanting substantially all resulting liquid and drying the seeds.
Claim 9
Independent Claim
96 words
A method for removing radioactive metallic seeds from embedment in nylon, the method comprising: adding nylon with radioactive metallic seeds embedded therein to a solvent in which nylon dissolves to form a mixture comprising dissolved and undissolved nylon, solvent and metallic seeds; vibrating the mixture at ultrasonic frequencies to substantially completely dissolve the nylon in the solvent, thus freeing up the metallic seeds; decanting the solvent and repeating the foregoing steps of adding solvent and vibrating at ultrasonic frequencies; and thereafter adding acetone to the vibrated mixture, decanting substantially all resulting liquid and drying the seeds.
References Cited (Backward Citations)
US2505627A
Cited
US3007814A
Cited
GB837955A
Cited
US3291640A
Cited
US3524768A
Cited
US3438365A
Cited
US3764384A
Cited
US3975208A
Cited
US4070203A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-25 | 1983-08-27 | 1984-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-25 | 1987-08-27 | 1988-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-25 | 1991-08-27 | 1992-02-26 | $7700.00 | Window Closed / Lapsed |