Patent US5716875A successfully refreshed from Google Patents.
Patent US2615630A successfully refreshed from Google Patents.
US2615630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structural form of slide rules
Assignee: Individual
•
Filing: 1949-02-05
•
Granted: 1952-10-28
•
Expires: 1969-02-05
Abstract
No abstract record available.
Inventors
- 👤 Eckel Arthur Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:49
CPC Classifications
G; G06; G06G; G06G1/00; G06G1/02; G06G1/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1955-10-28 | 1956-04-28 | 1956-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-28 | 1960-04-28 | 1960-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-28 | 1964-04-28 | 1964-10-28 | $7700.00 | Window Closed / Lapsed |