US3413727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for the heattreatment of air-permeable materials
Assignee: Vepa AG
•
Filing: 1966-12-09
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Granted: 1968-12-03
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Expires: 1986-12-09
Abstract
No abstract record available.
Inventors
- 👤 Fleissner Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:22
CPC Classifications
F; F26; F26B; F26B13/00; F26B13/10; F26B13/14; F26B13/16; Y; Y10; Y10S; Y10S68/00; Y10S68/902; Y10S68/903
Claims Analysis
Total Claims: 0
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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) | 1971-12-03 | 1972-06-03 | 1972-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-03 | 1976-06-03 | 1976-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-03 | 1980-06-03 | 1980-12-03 | $7700.00 | Window Closed / Lapsed |