US3552859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical instrument for determining the parallelism or nonparallelism of two reflecting surfaces
Assignee: Texas Instruments Inc
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Filing: 1964-03-04
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Granted: 1971-01-05
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Expires: 1984-03-04
Abstract
Abstract AN OPTICAL APPARATUS IS DISCLOSED FOR USE IN MEASURING THE PARALLELISM OR DEGREE OF NOMPARALLELISM OF TWO REFLECING SURFACES WHICH ARE SEPARATED LATERALLY ALONG A LINE PARALLEL TO SAID SURFACES-HAS BEEN INSERTED BEFORE THE PERIOD. THE APPARATUS MEASURES THE EXACT DEGREE OF NON- PARALLELISM AND IS INSENSITIVE TO SMALL MOVEMENTS ABOUT ANY AXIS OF ROTATION.
Inventors
- 👤 John L Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:27
CPC Classifications
G; G01; G01C; G01C25/00
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |