US2945820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of exfoliated vermiculite
Assignee: Zonolite Co
•
Filing: 1957-01-03
•
Granted: 1960-07-19
•
Expires: 1977-01-03
Abstract
No abstract record available.
Inventors
- 👤 George E Ziegler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:20
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/02; C04B20/04; C04B20/06; Y; Y10; Y10S; Y10S71/00; Y10S71/904
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A PROCESS OF PRODUCING EXFOLIATED VERMICULITE COMPRISING THE STEPS OF CONTINUOUSLY FEEDING VERMICULITE ORE TO A FURNACE, HEATING THE ORE TO AN EXFOLIATING TEMPERATURE IN THE FURNACE, DISCHARGING THE EXFOLIATED VERMICULITE IN A STREAM FROM THE FURNACE, MAINTAINING THE HEAT IN THE FURNACE AT A DEGREE TO AFFORD A PREDETERMINED TEMPERATURE OF THE DISCHARGING STREAM, PERIODICALLY DETERMINING THE PRECENT SHRINKAGE OF THE VERMICULITE IN THE DISCHARGING STREAM BY SUBJECTING A SPECIMEN TAKEN FROM THE STREAM TO AT LEAST ONE WETTING AND DRYING CYCLE, ADJUSTING THE HEAT IN THE FURNACE TO A DEGREE PROVIDING A PREDETERMINED PERCENT SHRINKAGE OF THE VERMICULITE IN THE DISCHARGING STREAM, AND MAINTAINING THE HEAT IN THE FURNACE AT SAID ADJUSTED DEGREE.
Claim 2
Dependent Claim
115 words
A PROCESS OF PRODUCING EXFOLIATED VERMICULITE COMPRISING THE STEPS OF CONTINUOUSLY FEEDING VERMICULITE ORE TO A FURNACE, HEATING THE ORE TO AN EXFOLIATING TEMPERATURE IN THE FURNACE, DISCHARGING THE EXFOLIATED VERMICULITE IN A STREAM FROM THE FURNACE, MAINTAINING THE HEAT IN THE FURNACE AT A DEGREE TO AFFORD A PREDETERMINED TEMPERATURE OF THE DISCHARGING STREAM, PERIODICALLY DETERMINING THE PRECENT SHRINKAGE OF THE VERMICULITE IN THE DISCHARGING STREAM BY SUBJECTING A SPECIMEN TAKEN FROM THE STREAM TO AT LEAST ONE WETTING AND DRYING CYCLE, ADJUSTING THE HEAT IN THE FURNACE TO A DEGREE PROVIDING A PREDETERMINED PERCENT SHRINKAGE OF THE VERMICULITE IN THE DISCHARGING STREAM, AND MAINTAINING THE HEAT IN THE FURNACE AT SAID ADJUSTED DEGREE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-19 | 1964-01-18 | 1964-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-19 | 1968-01-18 | 1968-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-19 | 1972-01-18 | 1972-07-19 | $7700.00 | Window Closed / Lapsed |