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US1513813A
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Lens-grinding apparatus
Assignee: American Optical Corp
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Filing: 1922-04-18
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Granted: 1924-11-04
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Expires: 1942-04-18
Abstract
No abstract record available.
Inventors
- 👤 Kenneth V Hill
- 👤 Edgar D Tillyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:46
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/02; B24B55/00; B24B55/02; Y; Y10; Y10S; Y10S29/00; Y10S29/054; Y10S29/088
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) | 1927-11-04 | 1928-05-05 | 1928-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-11-04 | 1932-05-05 | 1932-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-11-04 | 1936-05-05 | 1936-11-04 | $7700.00 | Window Closed / Lapsed |