Patent US3485671A successfully refreshed from Google Patents.
US3485671A
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US
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Method of cleaning air supply systems and ducts
Assignee: FOOD PRODUCTS Inc
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Filing: 1966-12-19
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Granted: 1969-12-23
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Expires: 1986-12-19
Abstract
No abstract record available.
Inventors
- 👤 George R Stephens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:26
CPC Classifications
B; B24; B24C; B24C3/00; B24C3/32; B24C3/325; B24C3/327; B08; B08B; B08B9/00; B08B9/02; B08B9/027; B08B9/04; B08B9/053; B08B9/057; F; F24; F24F; F24F13/00; F24F13/02; F24F2221/00; F24F2221/22; Y; Y10; Y10S; Y10S55/00; Y10S55/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2087694A
Cited
US2367918A
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US2426072A
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US2622047A
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US2627149A
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US2972502A
Cited
US2948092A
Cited
US3090166A
Cited
US3033711A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-22 | 1973-06-23 | 1973-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-22 | 1977-06-23 | 1977-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-22 | 1981-06-23 | 1981-12-23 | $7700.00 | Window Closed / Lapsed |