US2879943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Instantaneous liquid heater
Assignee: Arthur D Little Inc
•
Filing: 1955-06-06
•
Granted: 1959-03-31
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Expires: 1975-06-06
Abstract
No abstract record available.
Inventors
- 👤 Dubitzky Michael
- 👤 Thomas S Hargreaves
- 👤 Donald E Keyt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:15
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/01; G05D23/13; F; F23; F23N; F23N1/00; F23N1/08; F23N1/087; F24; F24D; F24D17/00; F24H; F24H1/00; F24H1/10; F24H1/12; F24H1/14; F24H1/145; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7847
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB500008A
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US2177731A
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US2340489A
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US2287840A
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US2326096A
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US2369242A
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US2676613A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-30 | 1962-09-29 | 1963-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-30 | 1966-09-29 | 1967-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-30 | 1970-09-29 | 1971-03-31 | $7700.00 | Window Closed / Lapsed |