US3444031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light screens and method of making the same
Assignee: Dow Chemical Co
•
Filing: 1964-04-22
•
Granted: 1969-05-13
•
Expires: 1984-04-22
Abstract
No abstract record available.
Inventors
- 👤 Walter J Schrenk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:39
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/62; B; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/305; B29C48/307; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24132; Y10T428/24174; Y10T428/24942; Y10T428/2495
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US631220A
Cited
US2174779A
Cited
US2258353A
Cited
US2695430A
Cited
US3031351A
Cited
US2980567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |