Patent US4974642A successfully refreshed from Google Patents.
US2200733A
Expired / Lapsed
US
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Radiator shutter unit
Assignee: Pines Winterfront Co
•
Filing: 1937-01-15
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Granted: 1940-05-14
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Expires: 1957-01-15
Abstract
No abstract record available.
Inventors
- 👤 William C Agerell
- 👤 John D Durant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:52
CPC Classifications
F; F01; F01P; F01P7/00; F01P7/02; F01P7/10; Y; Y10; Y10S; Y10S165/00; Y10S165/092; Y10S165/093; Y10S165/096; Y10S165/097
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) | 1943-05-14 | 1943-11-13 | 1944-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-05-14 | 1947-11-13 | 1948-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-05-14 | 1951-11-13 | 1952-05-14 | $7700.00 | Window Closed / Lapsed |