US3100679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for purifying air in inhabitable or product-confining enclosures
Assignee: Individual
•
Filing: 1961-01-24
•
Granted: 1963-08-13
•
Expires: 1981-01-24
Abstract
No abstract record available.
Inventors
- 👤 Richard W Kritzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:03
CPC Classifications
F; F24; F24F; F24F8/00; F24F8/20; F24F8/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1932379A
Cited
US2553711A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-08-12 | 1967-02-11 | 1967-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-12 | 1971-02-11 | 1971-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-12 | 1975-02-11 | 1975-08-13 | $7700.00 | Window Closed / Lapsed |