US2829772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purifier
Assignee: Individual
•
Filing: 1956-02-01
•
Granted: 1958-04-08
•
Expires: 1976-02-01
Abstract
No abstract record available.
Inventors
- 👤 John T Landes
- 👤 Roger S Greenough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:32
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/46; B07B1/50; B07B1/54
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) | 1961-04-07 | 1961-10-07 | 1962-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-07 | 1965-10-07 | 1966-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-07 | 1969-10-07 | 1970-04-08 | $7700.00 | Window Closed / Lapsed |