US2841172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quantity regulator for gas heated continuous flow type hot water apparatus
Assignee: Vaillant GmbH
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Filing: 1954-03-09
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Granted: 1958-07-01
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Expires: 1974-03-09
Abstract
No abstract record available.
Inventors
- 👤 Hans Doenges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:51
CPC Classifications
G; G05; G05D; G05D7/00; G05D7/01; G05D7/0106; F; F24; F24H; F24H9/00; F24H9/20; F24H9/2007; F24H9/2035; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7787; Y10T137/7789; Y10T137/8593; Y10T137/86493; Y10T137/86879; Y10T137/86887; Y10T137/87265; Y10T137/87322; Y10T137/8741
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) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |