US3781536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illuminated diver's slate
Assignee: United States Department of the Navy
•
Filing: 1973-01-15
•
Granted: 1973-12-25
•
Expires: 1993-01-15
Abstract
Abstract A reusable, illuminated diver''s slate or writing tablet which utilizes a charge of chemiluminescent material. Light from the charge, preferably having wavelengths within a predetermined range, is directed through a light transmitting front wall, the surface of which is treated for writing. A mirrored rear wall increases efficiency of light use.
Inventors
- 👤 M Naeseth
- 👤 H Larrimore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:07
CPC Classifications
B; B43; B43L; B43L1/00; B43L1/004; B63; B63C; B63C11/00; B63C11/02; B63C11/26; F; F21; F21K; F21K2/00; F21K2/06; F21L; F21L19/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
89 words
A device for use by divers, comprising: flask means for containing a quantity of chemiluminescent material; said flask means being characterized by a substantially plane, light transmitting first wall having a surface capable of being written upon by a pencil, and a substantially plane, light transmitting second wall disposed in spaced, parallel relation to said first wall; mirror means, disposed on said second wall, for reflecting light from chemiluminescent material, when such is contained in said flask means, through said first wall; and chemiluminescent material filling said flask means.
Claim 2
Independent Claim
89 words
A device for use by divers, comprising: flask means for containing a quantity of chemiluminescent material; said flask means being characterized by a substantially plane, light transmitting first wall having a surface capable of being written upon by a pencil, and a substantially plane, light transmitting second wall disposed in spaced, parallel relation to said first wall; mirror means, disposed on said second wall, for reflecting light from chemiluminescent material, when such is contained in said flask means, through said first wall; and chemiluminescent material filling said flask means.
Claim 3
Dependent Claim
23 words
A device as defined in claim 1, and wherein: said first wall is substantially rectangular in plan and comprises a matte outer surface.
Claim 4
Dependent Claim
51 words
A device as defined in claim 2, and wherein: said flask means comprises a portion defining an opening to the interior thereof; and closure means for closing said opening with said chemiluminescent material within said mask means, said closure means being removable to permit removal and replacement of said chemiluminescent material.
Claim 5
Dependent Claim
17 words
A device as defined in claim 3, and wherein: said light transmitting walls are formed of glass.
Claim 6
Dependent Claim
37 words
A device as defined in claim 4 and wherein: said chemiluminescent material generates light energy having predominant wavelengths in a predetermined range; and said light transmitting walls are characterized by ability to transmit light in said range.
Claim 7
Dependent Claim
23 words
A device as defined in claim 5, and wherein: said predetermined range includes those wavelengths of light most readily transmitted by sea water.
Claim 8
Dependent Claim
20 words
A device as defined in claim 3, and wherein: said light transmitting walls are formed of a rigid plastic material.
Claim 9
Dependent Claim
37 words
A device as defined in claim 7, and wherein: said chemiluminescent material generates light energy having predominant wavelengths in a predetermined range; and said light transmitting walls are characterized by ability to transmit light in said range.
Claim 10
Dependent Claim
23 words
A device as defined in claim 8, and wherein: said predetermined range includes those wavelengths of light most readily transmitted by sea water.
Claim 11
Independent Claim
141 words
A device for diver communication comprising in combination: a flask including rectangular plane parallel front and rear walls interconnected by side, bottom, and top walls, so as to define a cavity therebetween; at least said front wall being light transmitting for light having wavelengths in the range of 0.40 to 0.58 Mu ; a mirror surface associated with said rear wall and operative to reflect light toward said front waLl; said front wall presenting an outer surface which is characterized as being rough, so as to accept markings by a common lead pencil; an opening through one of said walls for introducing material into, and removing material from, said cavity; stopper means for closing said opening; a quantity of light generating, chemiluminescent material filling said cavity; and said chemiluminescent material being active to generate light having predominant wavelengths within said range.
Claim 12
Independent Claim
141 words
A device for diver communication comprising in combination: a flask including rectangular plane parallel front and rear walls interconnected by side, bottom, and top walls, so as to define a cavity therebetween; at least said front wall being light transmitting for light having wavelengths in the range of 0.40 to 0.58 Mu ; a mirror surface associated with said rear wall and operative to reflect light toward said front waLl; said front wall presenting an outer surface which is characterized as being rough, so as to accept markings by a common lead pencil; an opening through one of said walls for introducing material into, and removing material from, said cavity; stopper means for closing said opening; a quantity of light generating, chemiluminescent material filling said cavity; and said chemiluminescent material being active to generate light having predominant wavelengths within said range.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |