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US2645209A
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US
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Ammonia containing water heating unit
Assignee: Individual
•
Filing: 1947-10-20
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Granted: 1953-07-14
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Expires: 1967-10-20
Abstract
No abstract record available.
Inventors
- 👤 Thomas J Digby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:37
CPC Classifications
F; F24; F24H; F24H1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1094301A
Cited
US1141247A
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US1568440A
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US1760884A
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US1747070A
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FR784072A
Cited
US2119091A
Cited
US2402899A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-13 | 1957-01-12 | 1957-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-13 | 1961-01-12 | 1961-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-13 | 1965-01-12 | 1965-07-14 | $7700.00 | Window Closed / Lapsed |