Patent US620211A successfully refreshed from Google Patents.
Patent US2853915A successfully refreshed from Google Patents.
US2853915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical angle measuring device
Assignee: Individual
•
Filing: 1955-06-03
•
Granted: 1958-09-30
•
Expires: 1975-06-03
Abstract
No abstract record available.
Inventors
- 👤 Reginald F Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:29
CPC Classifications
G; G01; G01C; G01C1/00; G01C1/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE313822C
Cited
US1601864A
Cited
GB269718A
Cited
US2038914A
Cited
US2170967A
Cited
US2185926A
Cited
US2237943A
Cited
US2307951A
Cited
US2557029A
Cited
US2486645A
Cited
US2471940A
Cited
US2577807A
Cited
US2610552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |