US3598517A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic control for balanced pressure process
Assignee: American Sterilizer Co
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Filing: 1969-05-12
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Granted: 1971-08-10
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Expires: 1989-05-12
Abstract
Abstract A PROCESS AND APPARATUS FOR STERILIZING ARTICLES SEALED IN PACKAGES MADE OF SEMI-PERMEABLE MEMBRANES, AND WITH OR WITHOUT POROUS OVERWRAP, IN A SEALED CHAMBER IN AN ATMOSPHERE OF PERMEABLE GAS. A CONTROL IS PROVIDED FOR REGULATING THE PRESSURE IN THE CHAMBER TO LIMIT THE DIFFERENTIAL PRESSURE BETWEEN THE PRESSURE INSIDE THE PACKAGE AND THE PRESSURE IN THE CHAMBER TO A PREDETERMINED VALUE SO THAT THE PRESSURE INSIDE THE PACKAGE WILL NEVER BE SUCH AS TO RUPTURE THE PACKAGE AND THE CHAMBER PRESSURE WILL NOT EXERT A PRESSURE ON THE OUTSIDE OF HE PACKAGE WHICH MIGHT DAMAGE ITS CONTENTS. THE STERILIZING GAS IS AN EPOXIDE, PREFERABLY ETHYLENE OXIDE.
Inventors
- 👤 Donald J Beecher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:16
CPC Classifications
A; A61; A61L; A61L2/00; A61L2/16; A61L2/20; A61L2/206
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |