US1556248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lens-cleaning process
Assignee: American Optical Corp
•
Filing: 1920-12-20
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Granted: 1925-10-06
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Expires: 1940-12-20
Abstract
No abstract record available.
Inventors
- 👤 Clarence H Ohlwiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:20
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/22; C11D7/24; C11D3/00; C11D3/0005; C11D3/0078; C11D7/02; C11D7/04; C11D7/08; C11D7/40
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) | 1928-10-05 | 1929-04-06 | 1929-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-10-05 | 1933-04-06 | 1933-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-10-05 | 1937-04-06 | 1937-10-06 | $7700.00 | Window Closed / Lapsed |