US3428031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Guide and supporting elements for indirect water heaters
Assignee: Individual
•
Filing: 1967-02-03
•
Granted: 1969-02-18
•
Expires: 1987-02-03
Abstract
No abstract record available.
Inventors
- 👤 Hans Viessmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:56
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/48; F24H1/52; F24D; F24D3/00; F24D3/08; F24D3/082; F24D3/087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1478855A
Cited
US1945349A
Cited
US2122256A
Cited
US2354932A
Cited
US2457009A
Cited
US2622854A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |