US2694847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aperture-defining form
Assignee: Individual
•
Filing: 1950-05-22
•
Granted: 1954-11-23
•
Expires: 1970-05-22
Abstract
No abstract record available.
Inventors
- 👤 William F Christiansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:27
CPC Classifications
E; E04; E04G; E04G15/00; E04G15/06; E04G15/061
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1631154A
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US1954788A
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US1996678A
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US2249824A
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US2234784A
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US2286564A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-11-22 | 1958-05-24 | 1958-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-22 | 1962-05-24 | 1962-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-22 | 1966-05-24 | 1966-11-23 | $7700.00 | Window Closed / Lapsed |