US3587438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gaseous atmosphere control device
Assignee: Space Defense Corp
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Filing: 1968-05-03
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Granted: 1971-06-28
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Expires: 1988-05-03
Abstract
Abstract A CONTROL SYSTEM FOR MAINTAINING THE COMPOSITION AND PRESSURE OF A GAS MIXTURE INCLUDING OXYGEN AT A PREDETERMINED TOTAL PRESSURE IN A CHAMBER AND SIMULTANEOUSLY MAINTAINING THE PARTIAL PRESSURE OF AT LEAST THE OXYGEN AT A PREDETERMINED LEVEL RELATIVE TO THE TOTAL PRESSURE OF THE MIXTURE. THE CONTROL SYSTEM IS CAPABLE OF PREFERENTIALLY SUPPLYING OXYGEN FROM A SOURCE TO THE CHAMBER WHENEVER THE OXYGEN PARTIAL PRESSURE IS BELOW THE PREDETERMINED LEVEL AND SUPPLYING A SECOND GAS FROM A SOURCE WHEN THE TOTAL PRESSURE IS BELOW THE PREDETERMINED LEVEL WHILE THE OXYGEN IS AT THE PREDETERMINED PARTIAL PRESSURE LEVEL.
Inventors
- 👤 Donald L Foster
- 👤 Leonard Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:46
CPC Classifications
B; B64; B64D; B64D13/00; B64D13/02; B64D13/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |