Patent US3607457A successfully refreshed from Google Patents.
US3607457A
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Method of manufacturing a rotary scanning prism
Assignee: Saab Bofors AB
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Filing: 1969-05-29
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Granted: 1971-09-21
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Expires: 1989-05-29
Abstract
Abstract A method of producing a light-reflecting prism such as a mirror prism of equilateral polygonal cross section for image scanning by high speed rotation of the prism about its center axis by tempering and aging a steel blank. The blank is then machined to size and the sidewalls of the steel block thus obtained are coated with a highly light-reflecting metal such as gold.
Inventors
- 👤 Bengt Olov Hagg
- 👤 Tore Bertil Reinhold Olsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:20
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/08; G02B5/09; C; C21; C21D; C21D1/00; C21D1/56; C21D1/607; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49982; Y10T29/49986
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
72 words
The method according to claim 1 and comprising the steps of hardening the steel block by heating the same to a predetermined temperature, placing the heated block in a sodium chloride bath until the block is cooled to a predetermined temperature range, than further cooling the block in air to a lower predetermined temperature, and then reheating the steel block until it reaches a predetermined elevated temperature effecting tempering of the block.
Claim 2
Dependent Claim
75 words
The method according to claim 2 wherein the steel block is heated to a temperature between 800* C. and 900* C., then cooled for 2 to 5 minutes by submersion in a sodium chloride bath having a temperature between 200* C.- 250* C., then air cooling the steel block to a temperature between 90* C. and 110* C., and reheating the steel block until it reaches a tempering temperature between 500* C. to 600* C.
Claim 3
Dependent Claim
42 words
The method according to claim 3 wherein the steel block is heated to about 850* C., then cooled in the sodium chloride bath to about 225* C., then cooled in air to about 100* C. and then reheated to about 500* C.
Claim 4
Dependent Claim
42 words
The method according to claim 1 and comprising the step of aging the preshaped steel block by heating the same to a temperature between 170* C. and 190* C. and maintaining the steel block at said temperature for 90 to 110 hours.
Claim 5
Dependent Claim
28 words
The method according to claim 5 wherein the steel block is heated to a temperature of about 180* C. and maintained at said temperature for about 100 hours.
Claim 6
Dependent Claim
21 words
The method according to claim 5 wherein subsequent to aging said steel block is machined by lapping to its final shape.
Claim 7
Dependent Claim
24 words
The method according to claim 1 wherein the metal coating is applied to the facets of the steel block by a cathode atomization process.
Claim 8
Dependent Claim
25 words
The step according to claim 1 wherein the metal coating is applied to the facets of the steel block by precipitation in an electrolytic bath.
Claim 9
Dependent Claim
31 words
The method according to claim 9 wherein the metal coating is applied to the facets of the steel block in an electrolytic bath containing gold salts thereby producing a gold coating.
Claim 10
Dependent Claim
15 words
The method according to claim 10 wherein said bath is a potassium gold cyanide bath.
References Cited (Backward Citations)
US2585128A
Cited
US3202530A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |