US2437807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical projection dividing head
Assignee: Alfred Herbert Ltd
•
Filing: 1944-12-19
•
Granted: 1948-03-16
•
Expires: 1964-12-19
Abstract
No abstract record available.
Inventors
- 👤 Dowell John Hendri
- 👤 Sternberg Robert Siegmund
- 👤 Curson Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:36
CPC Classifications
B; B23; B23Q; B23Q17/00; B23Q17/24; B23F; B23F23/00; B23F23/08; Y; Y10; Y10T; Y10T74/00; Y10T74/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US432621A
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DE338206C
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US1421523A
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US1854760A
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US2086391A
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US2059753A
Cited
US2253795A
Cited
US2288243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-16 | 1951-09-15 | 1952-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-16 | 1955-09-15 | 1956-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-16 | 1959-09-15 | 1960-03-16 | $7700.00 | Window Closed / Lapsed |