US2974407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of vision block installation
Assignee: Individual
•
Filing: 1957-03-15
•
Granted: 1961-03-14
•
Expires: 1977-03-15
Abstract
No abstract record available.
Inventors
- 👤 Irwin R Barr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:15
CPC Classifications
F; F41; F41H; F41H5/00; F41H5/26; F41H5/263; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/4998
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2732613A
Cited
US1974432A
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US2222755A
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US2324503A
Cited
US2400401A
Cited
US2460874A
Cited
US2480966A
Cited
US2644199A
Cited
US2770012A
Cited
US2769203A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-13 | 1964-09-12 | 1965-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-13 | 1968-09-12 | 1969-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-13 | 1972-09-12 | 1973-03-14 | $7700.00 | Window Closed / Lapsed |