Patent US2330709A successfully refreshed from Google Patents.
US2330709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projector
Assignee: SPENCER LENS CO
•
Filing: 1940-05-24
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Granted: 1943-09-28
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Expires: 1960-05-24
Abstract
No abstract record available.
Inventors
- 👤 Kennard W Harper
- 👤 Albin A Gradisar
- 👤 William K Armagost
- 👤 William F Peck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:55
CPC Classifications
G; G03; G03B; G03B23/00; Y; Y10; Y10S; Y10S353/00; Y10S353/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1946-09-27 | 1947-03-29 | 1947-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-09-27 | 1951-03-29 | 1951-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-09-27 | 1955-03-29 | 1955-09-28 | $7700.00 | Window Closed / Lapsed |