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Patent US2688772A successfully refreshed from Google Patents.
US2688772A
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Treatment of craze susceptible plastic articles
Assignee: Lockheed Martin Corp
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Filing: 1951-08-25
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Granted: 1954-09-14
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Expires: 1971-08-25
Abstract
No abstract record available.
Inventors
- 👤 Paul E Sandorff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:23
CPC Classifications
B; B29; B29C; B29C35/00; B29C35/16; B29C71/00; B29C71/02; B29C2035/1616; B29K; B29K2033/00; B29K2033/04; B29L; B29L2031/00; B29L2031/30; B29L2031/3076; B29L2031/3079; B29L2031/778
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) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |