Patent US2918921A successfully refreshed from Google Patents.
US2918921A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filing unit
Assignee: Individual
•
Filing: 1956-05-09
•
Granted: 1959-12-29
•
Expires: 1976-05-09
Abstract
No abstract record available.
Inventors
- 👤 Herald L Carlston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:02
CPC Classifications
G; G06; G06K; G06K21/00; G06K21/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US866167A
Cited
US1413041A
Cited
US1713945A
Cited
US1454152A
Cited
US1956527A
Cited
US2134715A
Cited
US2385541A
Cited
FR940645A
Cited
US2725913A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-28 | 1963-06-29 | 1963-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-28 | 1967-06-29 | 1967-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-28 | 1971-06-29 | 1971-12-29 | $7700.00 | Window Closed / Lapsed |