Patent US2269790A successfully refreshed from Google Patents.
US2269790A
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Assignee: Central Scientific Co
•
Filing: 1938-08-31
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Granted: 1942-01-13
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Expires: 1958-08-31
Abstract
No abstract record available.
Inventors
- 👤 Richard M Sherrill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:07
CPC Classifications
B; B01; B01L; B01L9/00; B01L9/50; Y; Y10; Y10S; Y10S8/00; Y10S8/03; Y10T; Y10T24/00; Y10T24/34; Y10T24/3427; Y10T24/3428; Y10T24/3431; Y10T24/3433; Y10T24/3435; Y10T24/39; Y10T24/3936; Y10T24/44; Y10T24/44265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-01-12 | 1945-07-14 | 1946-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-01-12 | 1949-07-14 | 1950-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-01-12 | 1953-07-14 | 1954-01-13 | $7700.00 | Window Closed / Lapsed |