US3598631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing low friction surface
Assignee: Individual
•
Filing: 1969-03-19
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Granted: 1971-08-10
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Expires: 1989-03-19
Abstract
Abstract A LOW-FRICTION FLOW SURFACE FOR AIRSHIP ENVELOPES OR OUTER SURFACES OF AIRPLANES, FLOW SURFACES OF WIND-TUNNELS AND THE LIKE AND THE PROCESS FOR MANUFACTURING SUCH LOWFRICTION FLOW SURFACES WHEREIN A METAL FOIL IS HEATED AND, AT THE SAME TIME, DE-GASSED IMMEDIATELY AFTER WHICH A HYDROPHOBE LAYER IS APPLIED TO THE HEATED FOIL IN A VACUUM OR A PROTECTIVE GAS WITH SAID HYDROPHOBE LAYER BEING APPLIED BY SQUEEZING AND SUBSEQUENTLY EVEN-MELTING THE MATERIAL OF THE HYDROPHOBE LAYER ONTO THE FOIL.
Inventors
- 👤 Hermann E R Papst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:13
CPC Classifications
B; B64; B64B; B64B1/00; B64B1/58; B64B1/64; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B64B1/06; B64B1/12; B64B1/60; B64B1/62; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |