US2921734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal systems
Assignee: MORRIS M MARKS
•
Filing: 1956-08-10
•
Granted: 1960-01-19
•
Expires: 1976-08-10
Abstract
No abstract record available.
Inventors
- 👤 Whildin Orvilla May
- 👤 Casimira H Steube
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:35
CPC Classifications
A; A47; A47G; A47G29/00; A47G29/12; A47G29/122; A47G29/1225; A47G2029/1226; A47G2029/1229
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US295581A
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US764233A
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US823730A
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US908500A
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US1436609A
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US1442578A
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US1808235A
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US1976117A
Cited
US2467475A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |