US3804753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of dewatering sewage sludge and converting the same to a useable product
Assignee: Calspan Corp
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Filing: 1972-12-07
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Granted: 1974-04-16
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Expires: 1992-12-07
Abstract
Abstract A PROCESS OF DEWATERING SEWAGE SLUDGE OR THE LIKE WASTE AND CONVERTING THE SAME TO A USEABLE PRODUCT WHEREBY THE SLUDGE IS PLACED IN A POROUS CONTAINER AND SATURATED WITH A WATER DISPLACING INGREDIENT SUCH AS TECHNICAL GRADE BUTANOL, AFTER A PERIOD OF TIME SUFFICIENT FOR DEHYDRATION TO OCCUR, THE CONTAINER PORES ARE CLOSED, AND TO THE SLUDGE IS ADDED A POLYMERIZABLE MATERIAL FOR A PERIOD OF TIME AT AN ELEVATED TEMPERATURE SUFFICIENT TO PERMIT COMPLETE POLYMERIZATION TO OCCUR.
Inventors
- 👤 R Baier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:57
CPC Classifications
C; C02; C02F; C02F11/00; C02F11/008; C02F11/002; C08; C08F; C08F112/00; C08F112/02; C08F112/04; C08F112/06; C08F112/12; Y; Y10; Y10S; Y10S52/00; Y10S52/09
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) | 1977-04-15 | 1977-10-15 | 1978-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-15 | 1981-10-15 | 1982-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-15 | 1985-10-15 | 1986-04-16 | $7700.00 | Window Closed / Lapsed |