US2818860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and means for maintaining desired percentages of oxygen in oxygen tents or other spaces
Assignee: OLD DOMINION RES AND DEV CORP
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Filing: 1955-11-17
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Granted: 1958-01-07
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Expires: 1975-11-17
Abstract
No abstract record available.
Inventors
- 👤 Carl H Holm
- 👤 Joseph A Green
- 👤 Patrick W Gorman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:27
CPC Classifications
A; A61; A61G; A61G10/00; A61G10/04; G; G05; G05D; G05D7/00; G05D7/06; G05D7/0617
Claims Analysis
Total Claims: 0
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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) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |