US2997913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Proof plate for fringe comparator
Assignee: Magna Donnelly Corp
•
Filing: 1957-07-22
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Granted: 1961-08-29
•
Expires: 1977-07-22
Abstract
No abstract record available.
Inventors
- 👤 Jr James D Van Putten
- 👤 John F Donnelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:11
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/30; G01B11/306
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1154819A
Cited
US1756785A
Cited
US2450839A
Cited
GB602459A
Cited
US2455763A
Cited
US2718811A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |