Patent US3616442A successfully refreshed from Google Patents.
Patent US1730574A successfully refreshed from Google Patents.
US1730574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of artificial-light filters
Assignee: Individual
•
Filing: 1926-07-13
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Granted: 1929-10-08
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Expires: 1946-07-13
Abstract
No abstract record available.
Inventors
- 👤 Holub Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:26
CPC Classifications
F; F21; F21V; F21V9/00; F21V9/02; G; G02; G02B; G02B5/00; G02B5/20; Y; Y10; Y10T; Y10T442/00; Y10T442/20; Y10T442/259; Y10T442/2607; Y10T442/2762
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) | 1932-10-07 | 1933-04-08 | 1933-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-10-07 | 1937-04-08 | 1937-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-10-07 | 1941-04-08 | 1941-10-08 | $7700.00 | Window Closed / Lapsed |