US3608179A
Expired / Lapsed
US
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Method and apparatus for the manufacture of mirrors
Assignee: BAC AND BRITISH AEROSPACE
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Filing: 1969-01-24
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Granted: 1971-09-28
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Expires: 1989-01-24
Abstract
Abstract A METHOD AND APPARATUS ARE DESCRIBED FOR PRODUCING MIRRORS WITH A REFLECTING SURFACE OF A THIN FLEXIBLE REFLECTING MATERIAL IN WHICH A SHEET OF THE REFLECTING MATERIAL IS STRETCHED OVER A BACKING MEMBER HAVING A RAISED PERIPHERAL RIDGE BY GRIPPING AN OUTER ZONE OF THE SHEET AND DRAWING IT DOWN AROUND THE BACKING MEMBER, AND AN OUTER RING IS SUBSEQUENTLY FITTED OVER THE PERIPHERAL RIDGE OF THE BACKING MEMBER SO AS TO TRAP THE SHEET BETWEEN THE OUTER RING AND THE BACKING MEMBER.
Inventors
- 👤 Herbert Jeffree
- 👤 George Y Benzies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:05
CPC Classifications
B; B65; B65D; B65D90/00; B65D90/02; B65D90/022; A; A45; A45D; A45D42/00; A47; A47G; A47G1/00; B29; B29C; B29C63/00; B29C63/02; B29L; B29L2011/00; B29L2011/0058; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49867; Y10T29/49945; Y10T29/53; Y10T29/53678
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |