US3515664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Demineralizing process and apparatus
Assignee: Individual
•
Filing: 1967-01-17
•
Granted: 1970-06-02
•
Expires: 1987-01-17
Abstract
No abstract record available.
Inventors
- 👤 Allan M Johnson
- 👤 Richard F Gilman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:02
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01D61/46; B01D61/461; B01D57/00; B01D57/02; C; C02; C02F; C02F1/00; C02F1/46; C02F1/461; C02F1/46104; C02F1/46109; C02F1/469; C02F1/4691; B01D2311/00; B01D2311/26; B01D2311/2642; B01D2321/00; B01D2321/22; B01D2321/223; C02F1/42; C02F1/4604; C02F2001/46133; C02F2001/46152; C02F2001/46157; C02F2001/46161; C02F2103/00; C02F2103/08; Y; Y02; Y02A; Y02A20/00; Y02A20/124
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) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |