US2491525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-supporting film of styrene-isobutylene copolymer
Assignee: Standard Oil Development Co
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Filing: 1944-12-29
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Granted: 1949-12-20
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Expires: 1964-12-29
Abstract
No abstract record available.
Inventors
- 👤 William J Sparks
- 👤 David W Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:11
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/04; C08F210/08; C08F210/10; B; B29; B29C; B29C48/00; B29C48/15; B32; B32B; B32B27/00; C08J; C08J5/00; C08J5/12; C08J5/124; C08J5/18; C08L; C08L23/00; C08L23/02; C08L23/18; C08L23/20; C08L23/22; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441; H01B3/442; B29C48/03; B29C48/07; B29C48/08; C08J2323/00; C08J2323/02; C08J2323/18; C08J2323/20; C08J2323/22; C08J2325/00; C08J2325/02; C08J2325/04; C08J2325/08; C08L91/00; C08L91/06; Y; Y10; Y10T; Y10T428/00; Y10T428/26
Claims Analysis
Total Claims: 0
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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) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |