Patent US3713728A successfully refreshed from Google Patents.
US3713728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Product and method for making same
Assignee: OWELS IILINOIS Inc
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Filing: 1970-07-23
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Granted: 1973-01-30
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Expires: 1990-07-23
Abstract
Abstract One-piece, light-weight, transparent telescope mirror blanks consisting essentially of one integral shaped mass of transparent, low-expansion, at least partially crystallized glass ceramic having a pair of oppositely disposed face surfaces and a plurality of separate cavities between the face surfaces. One of the face surfaces of the mirror blank has a plurality of openings therein, each of the openings being in communication with a cavity. The cross-sectional area of the opening is smaller than the cross-sectional area of the cavity. Telescope mirrors can be made by coating the surface of the mirror blank with an appropriate reflecting coating. Methods of making the mirror blank and mirror are also disclosed as well as apparatus.
Inventors
- 👤 Donnell T O
- 👤 F Veres
- 👤 L Austin
- 👤 R Denman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:44
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0018; C03C10/0027; C03B; C03B19/00; C03B19/02; C03B32/00; C03B32/02; G; G02; G02B; G02B5/00; G02B5/08; Y; Y10; Y10T; Y10T428/00; Y10T428/16; Y10T428/162; Y10T428/24; Y10T428/24479; Y10T428/2457
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
111 words
A light-weight vitreous telescope mirror formed from a onepiece, light-weight, transparent, vitreous telescope mirror blank consisting of a single vitreous mass and having a pair of oppositely disposed face surfaces and a plurality of separate cavities disposed between said surfaces, one of said face surfaces being provided with a plurality of openings, each of said openings being disposed above and communicating with one of said cavities, each of said openings being smaller in crosssectional area than the cross-sectional area of said cavity, the volume between adjacent cavities being occupied by said vitreous mass, said surface of said blank opposite the surface with said openings and coated with a light-reflective coating thereon.
Claim 2
Dependent Claim
111 words
A light-weight vitreous telescope mirror formed from a onepiece, light-weight, transparent, vitreous telescope mirror blank consisting of a single vitreous mass and having a pair of oppositely disposed face surfaces and a plurality of separate cavities disposed between said surfaces, one of said face surfaces being provided with a plurality of openings, each of said openings being disposed above and communicating with one of said cavities, each of said openings being smaller in crosssectional area than the cross-sectional area of said cavity, the volume between adjacent cavities being occupied by said vitreous mass, said surface of said blank opposite the surface with said openings and coated with a light-reflective coating thereon.
Claim 3
Dependent Claim
111 words
A light-weight vitreous telescope mirror formed from a one-piece, light-weight, transparent, vitreous telescope mirror blank consisting of a single vitreous mass and having a pair of oppositely disposed face surfaces and a plurality of separate cavities disposed between said surfaces, one of said face surfaces being provided with a plurality of openings, each of said openings being disposed above and communicating with one of said cavities, each of said openings being smaller in cross-sectional area than the cross-sectional area of said cavity, the volume between adjacent cavities being occupied by said vitreous mass, said surface of said blank opposite the surface with said openings and coated with a light-reflective coating thereon.
Claim 4
Dependent Claim
111 words
A light-weight vitreous telescope mirror formed from a one-piece, light-weight, transparent, vitreous telescope mirror blank consisting of a single vitreous mass and having a pair of oppositely disposed face surfaces and a plurality of separate cavities disposed between said surfaces, one of said face surfaces being provided with a plurality of openings, each of said openings being disposed above and communicating with one of said cavities, each of said openings being smaller in cross-sectional area than the cross-sectional area of said cavity, the volume between adjacent cavities being occupied by said vitreous mass, said surface of said blank opposite the surface with said openings and coated with a light-reflective coating thereon.
References Cited (Backward Citations)
GB968025A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |