US3544005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot water circulation heating system
Assignee: Vaillant GmbH
•
Filing: 1969-01-07
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Granted: 1970-12-01
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Expires: 1989-01-07
Abstract
No abstract record available.
Inventors
- 👤 Hans Meier
- 👤 Max Albert Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:53
CPC Classifications
F; F24; F24D; F24D19/00; F24D19/08; F24D19/082; F24D19/083; F24D19/10; F24D19/1006; F24D19/1066; F24D19/1069; F24D3/00; F24D3/08; F24D3/087; F24H; F24H1/00; F24H1/48; F24H1/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |