Patent US3109912A successfully refreshed from Google Patents.
US3109912A
Expired / Lapsed
US
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Electric heater for heating compressed air
Assignee: Individual
•
Filing: 1961-12-21
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Granted: 1963-11-05
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Expires: 1981-12-21
Abstract
No abstract record available.
Inventors
- 👤 Ralph G Cerulli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:39
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/04; F24H3/0405
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US994259A
Cited
US1252614A
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US1519395A
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US2446367A
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US2482268A
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US2609477A
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US2797297A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-11-04 | 1967-05-06 | 1967-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-11-04 | 1971-05-06 | 1971-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-11-04 | 1975-05-06 | 1975-11-05 | $7700.00 | Window Closed / Lapsed |