Patent US4087695A successfully refreshed from Google Patents.
US4087695A
Expired / Lapsed
US
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Method for producing optical baffling material using pulsed electron beams
Assignee: United States Department of the Army
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Filing: 1977-01-17
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Granted: 1978-05-02
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Expires: 1997-01-17
Abstract
Abstract A method for producing durable optical baffling materials comprising polishing to a mirror finish the surface of a starting material, preferably having a very fine-grained structure, and then bombarding the surface of the starting material with low energy (0 to 50 keV) pulsed electrodes at a pulse length of about 0.1 microseconds. A fluence of 0.5 cal/cm2 renders the surface completely black in appearance, retaining none of its initial mirror-like properties.
Inventors
- 👤 John N. Lee
- 👤 Robert B. Oswald, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:31
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/10; G02B1/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
58 words
A method of producing a durable optical baffling material comprising the steps of: providing a starting material; polishing the surface of the starting material to a mirror finish; and bombarding the surface of the starting material with a pulsed beam of electrons having a pulse length of about 0.1 microseconds to make the surface appear black in color.
Claim 2
Independent Claim
58 words
A method of producing a durable optical baffling material comprising the steps of: providing a starting material; polishing the surface of the starting material to a mirror finish; and bombarding the surface of the starting material with a pulsed beam of electrons having a pulse length of about 0.1 microseconds to make the surface appear black in color.
Claim 3
Dependent Claim
26 words
The method of producing a durable optical baffling material recited in claim 1 wherein the providing step comprises: providing a starting material with a fine-grained structure.
Claim 4
Dependent Claim
46 words
The method of producing a durable optical baffling material recited in claim 1 wherein the bombarding step comprises: bombarding the surface of the starting material with a pulsed beam of electrons having an average energy of 25 keV. to make the surface appear black in color.
Claim 5
Dependent Claim
50 words
The method of producing a durable optical baffling material recited in claim 1 wherein the bombarding step comprises: bombarding the surface of the starting material with a pulsed beam of electrons having an energy in the range of 0 to 50 keV. to make the surface appear black in color.
Claim 6
Dependent Claim
47 words
The method of producing a durable optical baffling material recited in claim 1 wherein the bombarding step comprises: bombarding the surface of the starting material with a pulsed beam of electrons at a fluence of 0.5 cal/cm 2 to make the surface area appear black in color.
Claim 7
Dependent Claim
29 words
The method of producing optical baffling material recited in claim 1 wherein the providing step comprises: providing a starting material consisting of a thin, anodized film of beryllium oxide.
Claim 8
Dependent Claim
24 words
The method of producing optical baffling material recited in claim 1 wherein the providing step comprises: providing a starting material consisting of glassy carbon.
Claim 9
Independent Claim
48 words
A method of producing a durable optical baffling material comprising the steps of: providing a starting material consisting of a thin, anodized film of beryllium oxide; and bombarding the surface of the starting material with a pulsed beam of electrons to make the surface appear black in color.
Claim 10
Independent Claim
48 words
A method of producing a durable optical baffling material comprising the steps of: providing a starting material consisting of a thin, anodized film of beryllium oxide; and bombarding the surface of the starting material with a pulsed beam of electrons to make the surface appear black in color.
Claim 11
Independent Claim
43 words
A method of producing a durable optical baffling material comprising the steps of: providing a starting material consisting of glassy carbon; and bombarding the surface of the starting material with a pulsed beam of electrons to make the surface appear black in color.
Claim 12
Independent Claim
43 words
A method of producing a durable optical baffling material comprising the steps of: providing a starting material consisting of glassy carbon; and bombarding the surface of the starting material with a pulsed beam of electrons to make the surface appear black in color.
References Cited (Backward Citations)
US2702863A
Cited
US3354064A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |