Patent US2737173A successfully refreshed from Google Patents.
US2737173A
Expired / Lapsed
US
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Combustion type unit heater
Assignee: DELTA HEATING Corp
•
Filing: 1953-08-11
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Granted: 1956-03-06
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Expires: 1973-08-11
Abstract
No abstract record available.
Inventors
- 👤 Roy C Hauck
- 👤 Albert L Nathan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:18
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/06; F24H3/08; F24H3/087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US315040A
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US1723716A
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US1958331A
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US1994184A
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US2172399A
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US2161021A
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US2259187A
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US2302456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-06 | 1959-09-05 | 1960-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-06 | 1963-09-05 | 1964-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-06 | 1967-09-05 | 1968-03-06 | $7700.00 | Window Closed / Lapsed |