US3421859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inert atmosphere generator
Assignee: Whirlpool Corp
•
Filing: 1964-12-30
•
Granted: 1969-01-14
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Expires: 1984-12-30
Abstract
No abstract record available.
Inventors
- 👤 Roy W Kruggel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:48
CPC Classifications
A; A23; A23B; A23B2/00; A23B2/70; A23B2/704; A23B2/7045; A01; A01G; A01G7/00; A01G7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2472254A
Cited
US3362792A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |