US3498909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Desalination apparatus and process
Assignee: McDonnell Douglas Corp
•
Filing: 1966-12-29
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Granted: 1970-03-03
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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 19:07
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
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References Cited (Backward Citations)
US3198335A
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US760364A
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GB212233A
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US3019853A
Cited
US3193582A
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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 |