Patent DE687108C successfully refreshed from Google Patents.
US3814680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for purification of materials
Assignee: MELTZER H
•
Filing: 1971-05-06
•
Granted: 1974-06-04
•
Expires: 1991-05-06
Abstract
Abstract PURIFICATION OF MATERIALS SUC AS LIQUIDS IS ACCOMPLISHED BY SUBJECTING THE MATERIAL TO ULTRAVIOLET RADIATION. THE ULTRAVIOLET LIGHT SOURCE IS OPERATED AT HIGH FREQUENCY WHILE MAINTAINING THE GERMICIDAL WAVELENGTH THEREOF.
Inventors
- 👤 M Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:26
CPC Classifications
A; A61; A61L; A61L2/00; A61L2/02; A61L2/08; A61L2/10; C; C02; C02F; C02F1/00; C02F1/30; C02F1/32; C02F1/325; C02F2201/00; C02F2201/32; C02F2201/322; C02F2201/3221; C02F2201/3223; C02F2201/3227; C02F2201/324
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |