Patent US3428412A successfully refreshed from Google Patents.
US3428412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry cleaning method
Assignee: Dow Chemical Co
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Filing: 1964-04-27
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Granted: 1969-02-18
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Expires: 1984-04-27
Abstract
No abstract record available.
Inventors
- 👤 Herman S Gilbert
- 👤 Nicholas B Lorette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:26
CPC Classifications
D; D06; D06F; D06F43/00; D06F43/08; D06F43/086
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN A METHOD OF DRY CLEANING WHEREIN LIQUID SOLVENT IS CIRCULATED FROM A BASE TANK THROUGH SOILED FABRIC AND RETURNED TO SAID BASE TANK, FOLLOWED BY MECHANICALLY REMOVING SOLVENT FROM SAID FABRIC AND THEN HEATING ANY SOLVENT REMAINING IN SAID FABRIC TO DRY SAID FABRIC, THE STEPS COMPRISING WITHDRAWING A PREDETERMINED AMOUNT OF SAID CIRCULATED SOLVENT WHICH HAS CONTACTED SAID FABRIC AND WHICH CONTAINS THE HEAVIEST LOAD OF SOIL SUSPENDED OR DISSOLVED THEREIN AND THEN DISTILLING SAID PREDETERMINED AMOUNT OF SOILED SOLVENT BEFORE RETURNING IT TO SAID BASE TANK.
Claim 2
Dependent Claim
89 words
IN A METHOD OF DRY CLEANING WHEREIN LIQUID SOLVENT IS CIRCULATED FROM A BASE TANK THROUGH SOILED FABRIC AND RETURNED TO SAID BASE TANK, FOLLOWED BY MECHANICALLY REMOVING SOLVENT FROM SAID FABRIC AND THEN HEATING ANY SOLVENT REMAINING IN SAID FABRIC TO DRY SAID FABRIC, THE STEPS COMPRISING WITHDRAWING A PREDETERMINED AMOUNT OF SAID CIRCULATED SOLVENT WHICH HAS CONTACTED SAID FABRIC AND WHICH CONTAINS THE HEAVIEST LOAD OF SOIL SUSPENDED OR DISSOLVED THEREIN AND THEN DISTILLING SAID PREDETERMINED AMOUNT OF SOILED SOLVENT BEFORE RETURNING IT TO SAID BASE TANK.
References Cited (Backward Citations)
US2831332A
Cited
US2979375A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |