Patent US3707300A successfully refreshed from Google Patents.
US3707300A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tamperproof serial number
Assignee: Individual
•
Filing: 1971-09-01
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Granted: 1972-12-26
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Expires: 1991-09-01
Abstract
Abstract A serial number is imprinted on a chemical saturated tape encapsulated in plastic and surrounded by another pre-selected chemical in turn enclosed in a plastic container and affixed to an automobile or other item of personal property-said serial number will be destroyed due to intermixing of the chemicals when the serial number is tampered with.
Inventors
- 👤 Robert J Tamburro
- 👤 Ronald N Ohanian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:49
CPC Classifications
G; G09; G09F; G09F3/00; B; B60; B60R; B60R13/00; B60R13/10; Y; Y10; Y10S; Y10S428/00; Y10S428/916
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
61 words
A tamperproof serial number comprising, a tape for receiving printed numbers or letters, chemical means for saturating said tape, a plastic coating for encapsulating said saturated tape, a sealed transparent chamber for receiving said coated saturated tape, a transparent fluid for filling said chamber thereby surrounding said tape, said fluid and said saturating chemical corelating in contact to obliterate said printing.
Claim 2
Dependent Claim
61 words
A tamperproof serial number comprising, a tape for receiving printed numbers or letters, chemical means for saturating said tape, a plastic coating for encapsulating said saturated tape, a sealed transparent chamber for receiving said coated saturated tape, a transparent fluid for filling said chamber thereby surrounding said tape, said fluid and said saturating chemical corelating in contact to obliterate said printing.
Claim 3
Dependent Claim
25 words
A tamperproof serial number according to claim 1 which further includes means for dividing said compartment into multiple chambers thereby preventing removal of said fluid.
Claim 4
Dependent Claim
32 words
A tamperproof serial number according to claim 2 wherein said tape is affixed to the bottom of said chamber whereby movement of the chamber will result in repture of said tape coating.
Claim 5
Dependent Claim
24 words
A tamperproof serial number according to claim 3 wherein said fluid is a semi-paste which will not drain off if the chamber should leak.
Claim 6
Dependent Claim
51 words
A tamperproof serial number according to claim 4 wherein said chemical means is selected from the group consisting of ammonia, trygulate acid, sulfanate trygulate acid, and silver nitrate, and said fluid is selected from the group consisting of cobalt salt in solution, nickel chloride in solution, and ammonium chloride in solution.
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) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |