Patent US3437538A successfully refreshed from Google Patents.
US3437538A
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Method of forming an extruded sunscreen
Assignee: SUNSCREEN CORP
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Filing: 1966-02-14
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Granted: 1969-04-08
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Expires: 1986-02-14
Abstract
No abstract record available.
Inventors
- 👤 Walkley B Ewing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:54
CPC Classifications
A; A47; A47H; A47H21/00; B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/10; B29C48/13; B29C48/25; B29C48/30; B29C48/32; B29C48/33; B29C48/345; B29L; B29L2028/00; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1084; Y10T156/1085; Y10T156/1087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2919467A
Cited
US3060832A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-07 | 1972-10-07 | 1973-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-07 | 1976-10-07 | 1977-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-07 | 1980-10-07 | 1981-04-08 | $7700.00 | Window Closed / Lapsed |