US3531899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structure for holding flexible covers
Assignee: Poly Growers Inc
•
Filing: 1968-09-17
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Granted: 1970-10-06
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Expires: 1988-09-17
Abstract
No abstract record available.
Inventors
- 👤 Gary F Bartlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:36
CPC Classifications
E; E04; E04H; E04H15/00; E04H15/32; E04H15/34; E04H15/44; E04H15/48; E04H15/50; E04H15/505; A; A01; A01G; A01G9/00; A01G9/14; A01G9/1407; E04B; E04B1/00; E04B1/32; E04B1/3205; E04H15/64; E04H15/642; E04H15/648; E04B2001/3235; E04B2001/3241; E04B2001/3252; Y; Y02; Y02A; Y02A40/00; Y02A40/10; Y02A40/25; Y10; Y10S; Y10S135/00; Y10S135/906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1560114A
Cited
US1796581A
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US2353071A
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US2842073A
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US3080875A
Cited
US2914776A
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US3058518A
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US3424179A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-05 | 1974-04-06 | 1974-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-05 | 1978-04-06 | 1978-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-05 | 1982-04-06 | 1982-10-06 | $7700.00 | Window Closed / Lapsed |