US2798930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Convertible range
Assignee: Individual
•
Filing: 1953-11-20
•
Granted: 1957-07-09
•
Expires: 1973-11-20
Abstract
No abstract record available.
Inventors
- 👤 Robert M Frost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:36
CPC Classifications
F; F24; F24C; F24C7/00; F24C7/06; F24C15/00; F24C15/10; F24C15/102; Y; Y10; Y10S; Y10S439/00; Y10S439/928
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1213595A
Cited
US1179340A
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US1431953A
Cited
DE616550C
Cited
US2281958A
Cited
GB592986A
Cited
US2561125A
Cited
GB600388A
Cited
US2526476A
Cited
US2668222A
Cited
US2618730A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-08 | 1961-01-07 | 1961-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-08 | 1965-01-07 | 1965-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-08 | 1969-01-07 | 1969-07-09 | $7700.00 | Window Closed / Lapsed |