US3238839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical thickness gauge
Assignee: General Electric Co
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Filing: 1962-03-29
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Granted: 1966-03-08
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Expires: 1982-03-29
Abstract
No abstract record available.
Inventors
- 👤 Jr Harold R Day
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:56
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/02; G01B11/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A THICKNESS DETERMINING DEVICE FOR CONTINUOUSLY INDICATING THE THICKNESS OF A TRANSPARENT MEMBER HAVING TWO SUBSTANTIALLY FLAT PARALLEL SURFACES COMPRISING A SOURCE OF LIGHT THE SPECTRAL FREQUENCY OF WHICH VARIES AS DETECTED IN A PERIODIC MANNER WITH TIME, A DETECTOR FOR RECEIVING LIGHT FORWARDED BY SAID TWO SURFACES AND GENERATING A SIGNAL IN ACCORDANCE WITH THE LIGHT RECEIVED THEREBY, OUTPUT MEANS COUPLED TO SAID DETECTOR AND SYNCHRONIZED WITH THE PERIOD OF FREQUENCY VARIATION OF SAID SOURCE FOR RECEIVING SAID SIGNALS AND INDICATING LIGHT REINFORCEMENTS AND CANCELLATIONS CAUSED BY SAID LIGHT INTERFERING AT SAID TWO SURFACES DURING SUCCESSIVE PERIODS OF SPECTRAL VARIATION, THE NUMBER OF SAID REINFORCEMENTS AND SAID CANCELLATIONS OCCURING WITHIN ANY ONE TIME PERIOD BEING INDICATIVE OF THE THICKNESS OF SAID TRANSPARENT MEMBER.
Claim 2
Dependent Claim
124 words
A THICKNESS DETERMINING DEVICE FOR CONTINUOUSLY INDICATING THE THICKNESS OF A TRANSPARENT MEMBER HAVING TWO SUBSTANTIALLY FLAT PARALLEL SURFACES COMPRISING A SOURCE OF LIGHT THE SPECTRAL FREQUENCY OF WHICH VARIES AS DETECTED IN A PERIODIC MANNER WITH TIME, A DETECTOR FOR RECEIVING LIGHT FORWARDED BY SAID TWO SURFACES AND GENERATING A SIGNAL IN ACCORDANCE WITH THE LIGHT RECEIVED THEREBY, OUTPUT MEANS COUPLED TO SAID DETECTOR AND SYNCHRONIZED WITH THE PERIOD OF FREQUENCY VARIATION OF SAID SOURCE FOR RECEIVING SAID SIGNALS AND INDICATING LIGHT REINFORCEMENTS AND CANCELLATIONS CAUSED BY SAID LIGHT INTERFERING AT SAID TWO SURFACES DURING SUCCESSIVE PERIODS OF SPECTRAL VARIATION, THE NUMBER OF SAID REINFORCEMENTS AND SAID CANCELLATIONS OCCURING WITHIN ANY ONE TIME PERIOD BEING INDICATIVE OF THE THICKNESS OF SAID TRANSPARENT MEMBER.
References Cited (Backward Citations)
FR669880A
Cited
US2338981A
Cited
US2425758A
Cited
US2845838A
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US2882787A
Cited
US2948185A
Cited
US3062965A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |