US2448538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclic regulation of crystallizers
Assignee: STEARNS ROGER Manufacturing CO
•
Filing: 1943-09-20
•
Granted: 1948-09-07
•
Expires: 1963-09-20
Abstract
No abstract record available.
Inventors
- 👤 John E Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:38
CPC Classifications
C; C13; C13B; C13B25/00; C13B25/06; B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/0063; Y; Y10; Y10S; Y10S165/00; Y10S165/001
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2254389A
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US2302469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-07 | 1952-03-08 | 1952-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-07 | 1956-03-08 | 1956-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-07 | 1960-03-08 | 1960-09-07 | $7700.00 | Window Closed / Lapsed |