Patent US3421928A successfully refreshed from Google Patents.
US3421928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mar-resistant plastic sheet and process for producing same
Assignee: Wyeth Holdings LLC
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Filing: 1965-09-27
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Granted: 1969-01-14
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Expires: 1985-09-27
Abstract
No abstract record available.
Inventors
- 👤 Wallace Burton Ramsey
- 👤 Darwin Fiske De Lapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:16
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/28; B05D1/286; B05D7/00; B05D7/02; B05D7/04; B32; B32B; B32B27/00; C; C08; C08F; C08F283/00; C08F283/01; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/046; B05D3/00; B05D3/12; C08J2333/00; C08J2333/04; C08J2333/06; C08J2333/10; C08J2333/12; C08J2467/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/31794; Y10T428/31797; Y10T428/31855; Y10T428/31859
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |