Patent US4818489A successfully refreshed from Google Patents.
Patent US2550671A successfully refreshed from Google Patents.
US2550671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control means
Assignee: Individual
•
Filing: 1945-07-27
•
Granted: 1951-05-01
•
Expires: 1965-07-27
Abstract
No abstract record available.
Inventors
- 👤 George I Chinn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:46
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/06; F04B49/12; F04B49/123; F04B49/128; F04B1/00; F04B1/04; F04B1/06; F04B1/07; Y; Y10; Y10S; Y10S60/00; Y10S60/911
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) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |