US3135588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange of granular material in a gaseous medium
Assignee: Individual
•
Filing: 1958-03-31
•
Granted: 1964-06-02
•
Expires: 1978-03-31
Abstract
No abstract record available.
Inventors
- 👤 Helming Bernd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:44
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/36; C04B7/43; C04B7/432; C04B7/44; F; F27; F27B; F27B7/00; F27B7/20; F27B7/2016; F27B7/2025; F28; F28C; F28C3/00; F28C3/10; F28C3/12; F28C3/14; Y; Y02; Y02P; Y02P40/00; Y02P40/10; Y02P40/121
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US556129A
Cited
US1459326A
Cited
US1783464A
Cited
US2240854A
Cited
US2317479A
Cited
US2361940A
Cited
FR884378A
Cited
US2435927A
Cited
US2435424A
Cited
US2578315A
Cited
DE841425C
Cited
US2575119A
Cited
US2663560A
Cited
US2683938A
Cited
US2744338A
Cited
US2853361A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |