Patent US4909988A successfully refreshed from Google Patents.
US4909988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam efficient prevacuum sterilizer cycle
Assignee: American Sterilizer Co
•
Filing: 1987-10-23
•
Granted: 1990-03-20
•
Expires: 2007-10-23
Abstract
Abstract A self-contained, closed loop steam sterilizer has an integral external boiler. The sterilizer employs a prevacuum sterilization cycle with a dwell phase to promote steam efficiency. A single pump accomplishes all pumping functions in a prioritized manner.
Inventors
- 👤 Robert W. Childers
- 👤 Thomas G. Cook
- 👤 David A. Karle
- 👤 Ronald P. Krahe
- 👤 George E. Sparber
- 👤 Gerald L. Yeaney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:13
CPC Classifications
A; A61; A61L; A61L2/00; A61L2/24
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
98 words
A method of steam sterilizing objects in a sealable sterilization chamber, comprising: providing a steam sterilizer cycle having at least one presterilization vacuum pulse, wherein said steam sterilizing cycle comprises a first charge phase wherein steam is introduced into a chamber until a predetermined elevated temperature is reached and a drain in said chamber is closed; a dwell phase wherein said predetermined elevated temperature is maintained at a substantially constant level; a vacuum pulse wherein said drain is opened and steam is not introduced; a second charge phase; a sterilization phase; a vacuum pulse; and a drying phase.
Claim 2
Independent Claim
98 words
A method of steam sterilizing objects in a sealable sterilization chamber, comprising: providing a steam sterilizer cycle having at least one presterilization vacuum pulse, wherein said steam sterilizing cycle comprises a first charge phase wherein steam is introduced into a chamber until a predetermined elevated temperature is reached and a drain in said chamber is closed; a dwell phase wherein said predetermined elevated temperature is maintained at a substantially constant level; a vacuum pulse wherein said drain is opened and steam is not introduced; a second charge phase; a sterilization phase; a vacuum pulse; and a drying phase.
Claim 3
Dependent Claim
51 words
The cycle recited in claim 1 further comprising, prior to the first charge phase, a start up charge of steam wherein steam is introduced into said chamber while said drain is open followed by an initial vacuum pulse wherein said drain remains open and steam is not introduced into said chamber.
References Cited (Backward Citations)
US3494725A
Cited
US4296067A
Cited
US4372916A
Cited
US4759909A
Cited
US4687635A
Cited
US4770851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-19 | 1993-09-18 | 1994-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-19 | 1997-09-18 | 1998-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-19 | 2001-09-18 | 2002-03-20 | $7700.00 | Window Closed / Lapsed |