US3434660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansion tank for hot-water heating systems
Assignee: EFFBE WERKE FRITZ BRUMME KG
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Filing: 1966-05-19
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Granted: 1969-03-25
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Expires: 1986-05-19
Abstract
No abstract record available.
Inventors
- 👤 Fritz Brumme
- 👤 Horst Boehme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:06
CPC Classifications
F; F24; F24D; F24D3/00; F24D3/10; F24D3/1008; F24D3/1016; F15; F15B; F15B1/00; F15B1/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |