Patent US3498909A successfully refreshed from Google Patents.
US3498909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Desalination apparatus and process
Assignee: McDonnell Douglas Corp
•
Filing: 1966-12-29
•
Granted: 1970-03-03
•
Expires: 1986-12-29
Abstract
No abstract record available.
Inventors
- 👤 Fred E Littman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:13
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/02; B01D71/04; B01D61/00; B01D61/02; B01D61/025; B01D61/08; B01D63/00; B01D63/02; B01D63/024; Y; Y02; Y02A; Y02A20/00; Y02A20/124; Y02A20/131
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3198335A
Cited
US760364A
Cited
GB212233A
Cited
US3019853A
Cited
US3193582A
Cited
US3228876A
Cited
US3246764A
Cited
US3186941A
Cited
US3279902A
Cited
US3422008A
Cited
US3269817A
Cited
US3368329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-02 | 1973-09-01 | 1974-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-02 | 1977-09-01 | 1978-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-02 | 1981-09-01 | 1982-03-03 | $7700.00 | Window Closed / Lapsed |