US3871064A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moire fringe pattern with thermal matching to aluminum or other materials
Assignee: Control Data Corp
•
Filing: 1974-03-25
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Granted: 1975-03-18
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Expires: 1994-03-25
Abstract
Abstract A method for manufacturing an optical grating which has a preselected coefficient of thermal expansion. The method comprises steps for easily and accurately affixing grating bars spanning a slot in a plate having the desired coefficient of thermal expansion.
Inventors
- 👤 George Frederick Schrader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:01
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/18; G02B7/00; G02B7/008; Y; Y10; Y10S; Y10S359/00; Y10S359/90; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1056; Y10T156/1062; Y10T156/1064; Y10T156/1074; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49906
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
154 words
A method for forming an optical grating having the thermal expansion characteristics of a preselected material, comprising the steps of a. forming a plate of the preselected material having a flat surface with a slot having first and second sides piercing the plate; b. forming a thin flat sheet of a material suitable for forming the bars of the grating; c. forming slits creating therebetween in the thin flat sheet bars which form the desired grating and which are longer than the distance between the first and seconds sides of the slot but do not extend to the edge of the sheet; d. bonding the sheet to the plate in a position causing each slit in the sheet to extend past the first and second sides of the slot in the plate; and e. removing portions of the sheet connections each end of each bar from an end of at least one adjacent bar.
Claim 2
Independent Claim
154 words
A method for forming an optical grating having the thermal expansion characteristics of a preselected material, comprising the steps of a. forming a plate of the preselected material having a flat surface with a slot having first and second sides piercing the plate; b. forming a thin flat sheet of a material suitable for forming the bars of the grating; c. forming slits creating therebetween in the thin flat sheet bars which form the desired grating and which are longer than the distance between the first and seconds sides of the slot but do not extend to the edge of the sheet; d. bonding the sheet to the plate in a position causing each slit in the sheet to extend past the first and second sides of the slot in the plate; and e. removing portions of the sheet connections each end of each bar from an end of at least one adjacent bar.
Claim 3
Dependent Claim
59 words
The method of claim 1, wherein the step of forming slots in the sheet comprises the steps of forming substantially side by side slots each having a first parallel-sided area of predetermined width between its parallel sides, and at alternating ends of adjacent slots a second area wider than the predetermined width, and spaced apart from adjacent widened areas.
Claim 4
Dependent Claim
42 words
The method of claim 2, wherein the step of removing portions of the sheet comprises the step of removing those areas of the sheet between adjacent second areas of the slots and removing areas disconnected from the bars by the previous step.
Claim 5
Dependent Claim
30 words
The method of claim 1, further comprising the step of maintaining temperature of the sheet above the temperature of the plate during at least a part of the bonding step.
Claim 6
Dependent Claim
25 words
The method of claim 1, wherein the plate-forming step comprises forming the plate from aluminum, and the sheet-forming step comprises forming the sheet from steel.
References Cited (Backward Citations)
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Cited
US1744642A
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US2232551A
Cited
US3542453A
Cited
US3585121A
Cited
US3600588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |