US3422887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condenser for distillation column
Assignee: Graham Manufacturing Co Inc
•
Filing: 1967-06-19
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Granted: 1969-01-21
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Expires: 1987-06-19
Abstract
No abstract record available.
Inventors
- 👤 Frederick D Berkeley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:30
CPC Classifications
B; B01; B01D; B01D5/00; B01D5/0057; B01D5/006; B01D5/0063; B01D5/0003; B01D5/0006; B01D5/0033; B01D5/0036; Y; Y10; Y10S; Y10S165/00; Y10S165/184; Y10S165/205; Y10S165/206
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) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |