US2688747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic helmet
Assignee: B F MCDONALD Co
•
Filing: 1952-05-26
•
Granted: 1954-09-14
•
Expires: 1972-05-26
Abstract
No abstract record available.
Inventors
- 👤 Marx Erich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:11
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/50; B29C66/51; B29C66/54; A; A42; A42B; A42B3/00; A42B3/04; A42B3/06; A42B3/062; A42B3/065; B29C33/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C43/00; B29C45/00; B29C51/00; B29C51/08; B29C51/082; B29C66/70; B29C66/71; B29K; B29K2067/00; B29L; B29L2031/00; B29L2031/48; B29L2031/4807; B29L2031/4814; B29L2031/4821
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US780782A
Cited
GB191419109A
Cited
US1162087A
Cited
US1594174A
Cited
US2177145A
Cited
US2297874A
Cited
US2421633A
Cited
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 |