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US2847003A
Expired / Lapsed
US
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Assignee: Individual
•
Filing: 1956-10-22
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Granted: 1958-08-12
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Expires: 1976-10-22
Abstract
No abstract record available.
Inventors
- 👤 Norman D Helmer
- 👤 Fred H Easton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:15
CPC Classifications
A; A63; A63B; A63B71/00; A63B71/08; A63B71/085; A63B2071/088
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2521039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-11 | 1962-02-10 | 1962-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-11 | 1966-02-10 | 1966-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-11 | 1970-02-10 | 1970-08-12 | $7700.00 | Window Closed / Lapsed |