US3677820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method to prevent glassware etching in a dishwasher
Assignee: Whirlpool Corp
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Filing: 1970-05-28
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Granted: 1972-07-18
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Expires: 1990-05-28
Abstract
Abstract A METHOD OF AND APPARATUS FOR SUBSTANTIALLY PREVENTING CORROSION OF GLASSWARE DURING WASHING THEREOF WITH A CORROSION PRODUCING DETERGENT SOLUTION IN A MECHANICAL DISHWASHER OF THE HOUSEHOLD TYPE IN WHICH AN ALKALINE DETERGENT SOLUTION CONTACTS THE GLASSWARE FOR CLEANING THEREOF WHILE SIMULTANEOUSLY CONTACTING A PIECE OF METAL COMPRISING EITHER ZINC OR MAGNESIUM OF A MIXTURE THEREOF.
Inventors
- 👤 Beverly J Rutkowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:34
CPC Classifications
A; A47; A47L; A47L15/00; A47L15/0002; A47L15/0018; A47L15/0049; A47L2601/00; A47L2601/02
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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |