Patent US3531622A successfully refreshed from Google Patents.
US3531622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric flow heater
Assignee: Individual
•
Filing: 1966-05-09
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Granted: 1970-09-29
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Expires: 1986-05-09
Abstract
No abstract record available.
Inventors
- 👤 Josef Kaiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:40
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/20; F24H9/2007; F24H9/2014; F24H9/2028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1194886A
Cited
US1554502A
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US2791671A
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US2973424A
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US3052776A
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US3088017A
Cited
GB876825A
Cited
US3209126A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-28 | 1974-03-30 | 1974-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-28 | 1978-03-30 | 1978-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-28 | 1982-03-30 | 1982-09-29 | $7700.00 | Window Closed / Lapsed |