Patent US3716740A successfully refreshed from Google Patents.
US2701554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
External flue water heater
Assignee: Rheem Manufacturing Co
•
Filing: 1950-09-11
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Granted: 1955-02-08
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Expires: 1970-09-11
Abstract
No abstract record available.
Inventors
- 👤 Richard S Rheem
- 👤 Stanton L Yarbrough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:49
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/18; F24H1/186
Claims Analysis
Total Claims: 0
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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) | 1958-02-07 | 1958-08-09 | 1959-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-07 | 1962-08-09 | 1963-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-07 | 1966-08-09 | 1967-02-08 | $7700.00 | Window Closed / Lapsed |