US3606829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drip coffee maker
Assignee: Individual
•
Filing: 1969-04-10
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Granted: 1971-09-21
•
Expires: 1989-04-10
Abstract
Abstract A BEAM OF LIGHT IS PASSED THROUGH A REPRESENTATIVE PORTION OF THE COFFEE IN THE POT OF DRIP COFFEE MAKER AND ONTO A PHOTO-ELECTRIC DEVICE. WHEN THE STRENGTH OF THE COFFEE REACES A PREDETERMINED LEVEL, AS DETERMINED BY THE INTENSITY OF THE LIGHT BEAM TRANSMITTED THEREBY AND FALLING ON THE PHOTO-ELECTRIC DEVICE, A VALVE IS CLOSED PREVENTING THE PASSAGE OF WATER FROM THE GROUNDS INTO THE POT, THEREBY TERMINATING THE BREWING PROCESS.
Inventors
- 👤 Melvin G Alwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:05
CPC Classifications
A; A47; A47J; A47J31/00; A47J31/44; A47J31/06; A47J31/0605; A47J31/10; A47J31/52
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |